chrome浏览器断网游戏

chrome浏览器，谷歌浏览器，断网游戏。
逐影的几篇文章，讲的非常仔细，非常感谢。
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><div id="runner-container" class="runner-container offline" style="height: 200px; width: 600px; background: #fff;">&nbsp;
</div><img id="sprite" style="display: none;"src="data:image/png;base64,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"alt="test"/></body><style></style><script type="text/javascript">var canvas = document.createElement('canvas'),a = document.getElementById('runner-container'),ctx = canvas.getContext('2d');canvas.id = 'c';canvas.width = 600;canvas.height = 150;a.appendChild(canvas);//坐标var spriteDefinition = {CACTUS_LARGE: {x: 332, y: 2},    //大仙人掌CACTUS_SMALL: {x: 228, y: 2}, //小仙人掌CLOUD: {x: 86, y: 2},         //云HORIZON: {x: 2, y: 54},          //地面MOON: {x: 484, y: 2},           //月亮PTERODACTYL: {x: 134, y: 2},    //翼龙RESTART: {x: 2, y: 2},          //重新开始按钮TEXT_SPRITE: {x: 655, y: 2},    //分数TREX: {x: 848, y: 2},           //霸王龙STAR: {x: 645, y: 2}           //星星},FPS = 60,DEFAULT_WIDTH = 600,imgSprite = document.getElementById('sprite');Runner.config = {ACCELERATION: 0.001,BG_CLOUD_SPEED: 0.2,BOTTOM_PAD: 10,CLEAR_TIME: 3000,CLOUD_FREQUENCY: 0.5,GAMEOVER_CLEAR_TIME: 750,GAP_COEFFICIENT: 0.6,GRAVITY: 0.6,INITIAL_JUMP_VELOCITY: 12,INVERT_FADE_DURATION: 10000,  //夜晚持续时间INVERT_DISTANCE: 700,   //每700距离进行昼夜交替MAX_CLOUDS: 6,            //云最大数量MAX_OBSTACLE_LENGTH: 3,MAX_OBSTACLE_DUPLICATION: 2,MAX_SPEED: 13,MIN_JUMP_HEIGHT: 35,MOBILE_SPEED_COEFFICIENT: 1.2,RESOURCE_TEMPLATE_ID: 'audio-resources',SPEED: 6,SPEED_DROP_COEFFICIENT: 3};Runner.defaultDimensions = {HEIGHT: 150,WIDTH: 600};Runner.classes = {CANVAS: 'runner-canvas',CONTAINER: 'runner-container',CRASHED: 'crashed',ICON: 'icon-offline',INVERTED: 'inverted',SNACKBAR: 'snackbar',SNACKBAR_SHOW: 'snackbar-show',TOUCH_CONTROLLER: 'controller'};Runner.sounds = {BUTTON_PRESS: 'offline-sound-press',HIT: 'offline-sound-hit',SCORE: 'offline-sound-reached'};Runner.keycodes = {JUMP: {'38': 1, '32': 1},  // Up, spacebarDUCK: {'40': 1},  // DownRESTART: {'13': 1}  // Enter};Runner.events = {ANIM_END: 'webkitAnimationEnd',CLICK: 'click',KEYDOWN: 'keydown',KEYUP: 'keyup',MOUSEDOWN: 'mousedown',MOUSEUP: 'mouseup',RESIZE: 'resize',TOUCHEND: 'touchend',TOUCHSTART: 'touchstart',VISIBILITY: 'visibilitychange',BLUR: 'blur',FOCUS: 'focus',LOAD: 'load'};function Runner(outerContainerId, opt_config) {if (Runner.instance_) {return Runner.instance_;}Runner.instance_ = this;//this.outerContainerEl = document.querySelector(outerContainerId);this.containerEl = null;this.snackbarEl = null;//this.detailsButton = this.outerContainerEl.querySelector('#details-button');this.config = opt_config || Runner.config;this.dimensions = Runner.defaultDimensions;this.canvas = null;this.ctx = null;this.tRex = null;this.distanceMeter = null;this.distanceRan = 0;this.highestScore = 0;this.time = 0;this.runningTime = 0;this.msPerFrame = 1000 / FPS;this.currentSpeed = this.config.SPEED;this.obstacles = [];  //障碍物this.started = false;this.activated = false;this.crashed = false;this.paused = false;this.inverted = false;this.invertTimer = 0;this.resizeTimerId_ = null;this.playCount = 0;// Sound FX.this.audioBuffer = null;this.soundFx = {};// Global web audio context for playing sounds.this.audioContext = null;// Images.this.images = {};this.imagesLoaded = 0;this.loadImages();}Runner.prototype = {loadImages: function () {this.spriteDef = spriteDefinition;this.init();},loadSounds: function () {this.audioContext = new AudioContext();},setSpeed: function (opt_speed) {if (opt_speed) this.currentSpeed = opt_speed;},init: function () {this.setSpeed();this.canvas = c;this.ctx = ctx;this.ctx.fillStyle = '#f7f7f7';this.ctx.fill();this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,this.config.GAP_COEFFICIENT);this.distanceMeter = new DistanceMeter(this.canvas, this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);this.tRex = new Trex(this.canvas, this.spriteDef.TREX);this.startListening();this.update();},//开场动画playIntro: function () {if (!this.started && !this.crashed) {this.playingIntro = true;this.tRex.playingIntro = true;var keyframes = '@-webkit-keyframes intro { ' +'from { width:' + Trex.config.WIDTH + 'px }' +'to { width: ' + this.dimensions.WIDTH + 'px }' +'}';document.styleSheets[0].insertRule(keyframes, 0);this.containerEl = document.getElementById('runner-container');this.containerEl.addEventListener('webkitAnimationEnd',this.startGame.bind(this));this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';this.containerEl.style.width = this.dimensions.WIDTH + 'px';this.activated = true;this.started = true;} else if (this.crashed) {this.restart();}},startGame: function () {this.runningTime = 0;this.playingIntro = false;this.tRex.playingIntro = false;this.containerEl.style.webkitAnimation = '';this.playCount++;document.addEventListener('visibilitychange', this.onVisibilityChange.bind(this));window.addEventListener('blur', this.onVisibilityChange.bind(this));window.addEventListener('focus', this.onVisibilityChange.bind(this));},clearCanvas: function () {this.ctx.clearRect(0, 0, this.dimensions.WIDTH, this.dimensions.HEIGHT);},//todoupdate: function () {this.drawPending = false;var now = getTimeStamp();var deltaTime = now - (this.time || now);this.time = now;if (this.activated) {this.clearCanvas();if (this.tRex.jumping) {this.tRex.updateJump(deltaTime);}this.runningTime += deltaTime;var hasObstacles = this.runningTime > this.config.CLEAR_TIME;//如果是第一次跳跃并且没有播放开场动画，则播放开场动画if (this.tRex.jumpCount == 1 && !this.playingIntro) {this.playIntro();}if (this.playingIntro) {this.horizon.update(0, this.currentSpeed, hasObstacles);} else {deltaTime = !this.started ? 0 : deltaTime;this.horizon.update(deltaTime, this.currentSpeed, hasObstacles,this.inverted);}var collision = hasObstacles &&checkForCollision(this.horizon.obstacles[0], this.tRex);if (!collision) {this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;if (this.currentSpeed < this.config.MAX_SPEED) {this.currentSpeed += this.config.ACCELERATION;}} else {this.gameOver();}var playAchievementSound = this.distanceMeter.update(deltaTime,Math.ceil(this.distanceRan));if (playAchievementSound) {this.playSound(this.soundFx.SCORE);}//若夜晚持续时间大于设定值则变为白天if (this.invertTimer > this.config.INVERT_FADE_DURATION) {this.invertTimer = 0;this.invertTrigger = false;this.invert();} else if (this.invertTimer) {this.invertTimer += deltaTime;} else {var actualDistance =this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));if (actualDistance > 0) {this.invertTrigger = !(actualDistance %this.config.INVERT_DISTANCE);if (this.invertTrigger && this.invertTimer === 0) {this.invertTimer += deltaTime;this.invert();}}}}if (!this.crashed) {this.tRex.update(deltaTime);this.raq();}},handleEvent: function (e) {return (function (evtType, events) {switch (evtType) {case events.KEYDOWN:case events.TOUCHSTART:case events.MOUSEDOWN:this.onKeyDown(e);break;case events.KEYUP:case events.TOUCHEND:case events.MOUSEUP:this.onKeyUp(e);break;}}.bind(this))(e.type, Runner.events);},startListening: function () {document.addEventListener(Runner.events.KEYDOWN, this);document.addEventListener(Runner.events.KEYUP, this);document.addEventListener(Runner.events.MOUSEDOWN, this);document.addEventListener(Runner.events.MOUSEUP, this);},stopListening: function () {document.removeEventListener(Runner.events.KEYDOWN, this);document.removeEventListener(Runner.events.KEYUP, this);document.removeEventListener(Runner.events.MOUSEDOWN, this);document.removeEventListener(Runner.events.MOUSEUP, this);},onKeyDown: function (e) {if (e.target != this.detailsButton) {if (!this.crashed && Runner.keycodes.JUMP[e.keyCode]) {e.preventDefault();if (!this.activated) {this.loadSounds();this.activated = true;}if (!this.tRex.jumping && !this.tRex.ducking) {this.tRex.startJump(this.currentSpeed);}}}if (this.activated && !this.crashed && Runner.keycodes.DUCK[e.keyCode]) {e.preventDefault();if (this.tRex.jumping) {// Speed drop, activated only when jump key is not pressed.this.tRex.setSpeedDrop();} else if (!this.tRex.jumping && !this.tRex.ducking) {// Duck.this.tRex.setDuck(true);}}},onKeyUp: function (e) {var keyCode = String(e.keyCode);var isjumpKey = Runner.keycodes.JUMP[keyCode] ||e.type == Runner.events.TOUCHEND ||e.type == Runner.events.MOUSEDOWN;if (this.isRunning() && isjumpKey) {e.preventDefault();this.tRex.endJump();} else if (Runner.keycodes.DUCK[keyCode]) {e.preventDefault();this.tRex.speedDrop = false;this.tRex.setDuck(false);} else if (this.crashed) {e.preventDefault();// Check that enough time has elapsed before allowing jump key to restart.var deltaTime = getTimeStamp() - this.time;if (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||(deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&Runner.keycodes.JUMP[keyCode])) {e.preventDefault();this.restart();}} else if (this.paused && isjumpKey) {// Reset the jump statee.preventDefault();this.tRex.reset();this.play();}},isLeftClickOnCanvas: function (e) {return e.button != null && e.button < 2 &&e.type == Runner.events.MOUSEUP && e.target == this.canvas;},raq: function () {if (!this.drawPending) {this.drawPending = true;this.raqId = requestAnimationFrame(this.update.bind(this));}},isRunning: function () {return !!this.raqId;},gameOver: function () {//this.playSound(this.soundFx.HIT);//vibrate(200);this.stop();this.crashed = true;this.distanceMeter.acheivement = false;this.tRex.update(100, Trex.status.CRASHED);// Game over panel.if (!this.gameOverPanel) {this.gameOverPanel = new GameOverPanel(this.canvas,this.spriteDef.TEXT_SPRITE, this.spriteDef.RESTART,this.dimensions);} else {this.gameOverPanel.draw();}// Update the high score.if (this.distanceRan > this.highestScore) {this.highestScore = Math.ceil(this.distanceRan);this.distanceMeter.setHighScore(this.highestScore);}// Reset the time clock.this.time = getTimeStamp();},stop: function () {this.activated = false;this.paused = true;cancelAnimationFrame(this.raqId);this.raqId = 0;},play: function () {if (!this.crashed) {this.activated = true;this.paused = false;this.tRex.update(0, Trex.status.RUNNING);this.time = getTimeStamp();this.update();}},restart: function () {if (!this.raqId) {this.playCount++;this.runningTime = 0;this.activated = true;this.crashed = false;this.distanceRan = 0;this.setSpeed(this.config.SPEED);this.time = getTimeStamp();this.containerEl.classList.remove(Runner.classes.CRASHED);this.clearCanvas();this.distanceMeter.reset(this.highestScore);this.horizon.reset();this.tRex.reset();//this.playSound(this.soundFx.BUTTON_PRESS);this.invert(true);this.update();}},onVisibilityChange: function (e) {if (document.hidden || document.webkitHidden || e.type == 'blur' ||document.visibilityState != 'visible') {this.stop();} else if (!this.crashed) {this.tRex.reset();this.play();}},playSound: function (soundBuffer) {if (soundBuffer) {var sourceNode = this.audioContext.createBufferSource();sourceNode.buffer = soundBuffer;sourceNode.connect(this.audioContext.destination);sourceNode.start(0);}},invert: function (reset) {if (reset) {a.classList.toggle(Runner.classes.INVERTED, this.invertTrigger);//document.body.classList.toggle(Runner.classes.INVERTED,false);this.invertTimer = 0;this.inverted = false;} else {this.inverted = a.classList.toggle(Runner.classes.INVERTED, this.invertTrigger);//this.inverted = document.body.classList.toggle(Runner.classes.INVERTED,this.invertTrigger);}}};window['Runner'] = Runner;function decodeBase64ToArrayBuffer(base64String) {var len = (base64String.length / 4) * 3;var str = atob(base64String);var arrayBuffer = new ArrayBuffer(len);var bytes = new Uint8Array(arrayBuffer);for (var i = 0; i < len; i++) {bytes[i] = str.charCodeAt(i);}return bytes.buffer;}GameOverPanel.dimensions = {TEXT_X: 0,TEXT_Y: 13,TEXT_WIDTH: 191,TEXT_HEIGHT: 11,RESTART_WIDTH: 36,RESTART_HEIGHT: 32};function GameOverPanel(canvas, textImgPos, restartImgPos, dimensions) {this.canvas = canvas;this.ctx = canvas.getContext('2d');this.canvasDimensions = dimensions;this.textImgPos = textImgPos;this.restartImgPos = restartImgPos;this.draw();}GameOverPanel.prototype = {/*** Update the panel dimensions.* @param {number} width New canvas width.* @param {number} opt_height Optional new canvas height.*/updateDimensions: function (width, opt_height) {this.canvasDimensions.WIDTH = width;if (opt_height) {this.canvasDimensions.HEIGHT = opt_height;}},/*** Draw the panel.*/draw: function () {var dimensions = GameOverPanel.dimensions;var centerX = this.canvasDimensions.WIDTH / 2;// Game over text.var textSourceX = dimensions.TEXT_X;var textSourceY = dimensions.TEXT_Y;var textSourceWidth = dimensions.TEXT_WIDTH;var textSourceHeight = dimensions.TEXT_HEIGHT;var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);var textTargetWidth = dimensions.TEXT_WIDTH;var textTargetHeight = dimensions.TEXT_HEIGHT;var restartSourceWidth = dimensions.RESTART_WIDTH;var restartSourceHeight = dimensions.RESTART_HEIGHT;var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);var restartTargetY = this.canvasDimensions.HEIGHT / 2;textSourceX += this.textImgPos.x;textSourceY += this.textImgPos.y;// Game over text from sprite.this.ctx.drawImage(imgSprite,textSourceX, textSourceY, textSourceWidth, textSourceHeight,textTargetX, textTargetY, textTargetWidth, textTargetHeight);// Restart button.this.ctx.drawImage(imgSprite,this.restartImgPos.x, this.restartImgPos.y,restartSourceWidth, restartSourceHeight,restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,dimensions.RESTART_HEIGHT);}};//地面function HorizonLine(canvas, spritePos) {this.spritePos = spritePos;this.canvas = canvas;this.ctx = canvas.getContext("2d");this.sourceDimensions = {};this.dimensions = HorizonLine.dimensions;this.sourceXPos = [this.spritePos.x, this.spritePos.x + this.dimensions.WIDTH];this.xPos = [];this.yPos = 0;this.bumpThreshold = 0.5;  //地形系数this.setSourceDimesions();this.draw();}HorizonLine.dimensions = {WIDTH: 600, //宽600HEIGHT: 12,   //高12像素YPOS: 127    //在画布中的位置};HorizonLine.prototype = {setSourceDimesions: function () {for (var dimension in HorizonLine.dimensions) {this.sourceDimensions[dimension] = HorizonLine.dimensions[dimension];this.dimensions[dimension] = HorizonLine.dimensions[dimension];}//地面在画布上的位置this.xPos = [0, HorizonLine.dimensions.WIDTH];//0,600this.yPos = HorizonLine.dimensions.YPOS;},//随机地形getRandomType: function () {return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;},draw: function () {this.ctx.drawImage(imgSprite,this.sourceXPos[0], this.spritePos.y,this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,this.xPos[0], this.yPos,this.dimensions.WIDTH, this.dimensions.HEIGHT);this.ctx.drawImage(imgSprite,this.sourceXPos[1], this.spritePos.y,this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,this.xPos[1], this.yPos,this.dimensions.WIDTH, this.dimensions.HEIGHT);},updateXPos: function (pos, increment) {var line1 = pos,line2 = pos === 0 ? 1 : 0;this.xPos[line1] -= increment;this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;if (this.xPos[line1] <= -this.dimensions.WIDTH) {this.xPos[line1] += this.dimensions.WIDTH * 2;this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;}},update: function (deltaTime, speed) {var increment = Math.floor(speed * (FPS / 1000) * deltaTime);if (this.xPos[0] <= 0) {this.updateXPos(0, increment);} else {this.updateXPos(1, increment);}this.draw();},reset: function () {this.xPos[0] = 0;this.xPos[1] = HorizonLine.dimensions.WIDTH;}};//云Cloud.config = {HEIGHT: 14,MAX_CLOUD_GAP: 400,MAX_SKY_LEVEL: 30,MIN_CLOUD_GAP: 100,MIN_SKY_LEVEL: 71,WIDTH: 46};function getRandomNum(min, max) {return Math.floor(Math.random() * (max - min + 1)) + min;}function getTimeStamp() {return performance.now();}function Cloud(canvas, spritePos, containerWidth) {this.canvas = canvas;this.ctx = canvas.getContext("2d");this.spritePos = spritePos;this.containerWidth = containerWidth;this.xPos = containerWidth;this.yPos = 0;this.remove = false;//云间隙this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP, Cloud.config.MAX_CLOUD_GAP);this.init();}Cloud.prototype = {init: function () {//云的高度随机this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL, Cloud.config.MIN_SKY_LEVEL);this.draw();},draw: function () {this.ctx.save();var sourceWidth = Cloud.config.WIDTH,sourceHeight = Cloud.config.HEIGHT;this.ctx.drawImage(imgSprite,this.spritePos.x, this.spritePos.y,sourceWidth, sourceHeight,this.xPos, this.yPos,sourceWidth, sourceHeight);this.ctx.restore();},update: function (speed) {if (!this.remove) {//向左移动this.xPos -= Math.ceil(speed);this.draw();if (!this.isVisible()) {this.remove = true;}}},//判断是否移出屏幕外isVisible: function () {return this.xPos + Cloud.config.WIDTH > 0;}};//夜晚//todoNightMode.config = {FADE_SPEED: 0.035,  //淡入淡出速度HEIGHT: 40, //月亮高度MOON_SPEED: 0.25, //月亮移动速度NUM_STARS: 2,   //星星数量STAR_SIZE: 9, //星星宽度STAR_SPEED: 0.3,//星星速度STAR_MAX_Y: 70, //星星在画布上出现的位置WIDTH: 20  //半个月度宽度};NightMode.phases = [140, 120, 100, 60, 40, 20, 0];function NightMode(canvas, spritePos, containerWidth) {this.spritePos = spritePos;this.canvas = canvas;this.ctx = canvas.getContext("2d");this.containerWidth = containerWidth;this.xPos = containerWidth - 50; //月亮的x坐标this.yPos = 30;    //月亮的y坐标this.currentPhase = 0;this.opacity = 0;this.stars = [];  //用于存储星星this.drawStars = false;this.placeStars();  //放置星星}NightMode.prototype = {update: function (activated) {if (activated && this.opacity == 0) {this.currentPhase++;if (this.currentPhase >= NightMode.phases.length) {this.currentPhase = 0;}}//淡入淡出if (activated && (this.opacity < 1 || this.opacity == 0)) {this.opacity += NightMode.config.FADE_SPEED;} else if (this.opacity > 0) {this.opacity -= NightMode.config.FADE_SPEED;}//移动月亮if (this.opacity > 0) {this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);//移动星星if (this.drawStars) {for (var i = 0; i < NightMode.config.NUM_STARS; i++) {this.stars[i].x = this.updateXPos(this.stars[i].x, NightMode.config.STAR_SPEED);}}this.draw();} else {this.opacity = 0;this.placeStars();}this.drawStars = true;},updateXPos: function (currentPos, speed) {if (currentPos < -NightMode.config.WIDTH) {currentPos = this.containerWidth;} else {currentPos -= speed;}return currentPos;},draw: function () {var moonSourceWidth = this.currentPhase == 3 ? NightMode.config.WIDTH * 2 :NightMode.config.WIDTH;var moonSourceHeight = NightMode.config.HEIGHT;var moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];var moonOutputWidth = moonSourceWidth;var starSize = NightMode.config.STAR_SIZE;var starSourceX = spriteDefinition.STAR.x;this.ctx.save();this.ctx.globalAlpha = this.opacity;if (this.drawStars) {for (var i = 0; i < NightMode.config.NUM_STARS; i++) {this.ctx.drawImage(imgSprite,starSourceX, this.stars[i].sourceY,starSize, starSize,Math.round(this.stars[i].x), this.stars[i].y,NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);}}this.ctx.drawImage(imgSprite,moonSourceX, this.spritePos.y,moonSourceWidth, moonSourceHeight,Math.round(this.xPos), this.yPos,moonOutputWidth, NightMode.config.HEIGHT);this.ctx.globalAlpha = 1;this.ctx.restore();},placeStars: function () {var segmentSize = Math.round(this.containerWidth / NightMode.config.NUM_STARS);for (var i = 0; i < NightMode.config.NUM_STARS; i++) {this.stars[i] = {};this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);this.stars[i].sourceY = spriteDefinition.STAR.y + NightMode.config.STAR_SIZE * i;}},reset: function () {this.currentPhase = 0;this.opacity = 0;this.update(false);}};Horizon.config = {BG_CLOUD_SPEED: 0.2,BUMPY_THRESHOLD: .3,CLOUD_FREQUENCY: .5,HORIZON_HEIGHT: 16,MAX_CLOUDS: 6};//地形function Horizon(canvas, spritePos, dimensions, gapCoefficient) {this.canvas = canvas;this.ctx = canvas.getContext("2d");this.config = Horizon.config;this.dimensions = dimensions;this.gapCoefficient = gapCoefficient;//障碍物列表this.obstacles = [];this.obstacleHistory = [];this.horizonOffsets = [0, 0];this.cloudFrequency = this.config.CLOUD_FREQUENCY;this.spritePos = spritePos;this.nightMode = null;//云this.clouds = [];this.cloudSpeed = this.config.BG_CLOUD_SPEED;//地面this.horizonLine = null;this.init();}Horizon.prototype = {//初始化地平面，云init: function () {this.addCloud();this.horizonLine = new HorizonLine(this.canvas, this.spritePos.HORIZON);this.nightMode = new NightMode(this.canvas, this.spritePos.MOON, this.dimensions.WIDTH);},update: function (deltaTime, currentSpeed, updateObstacles, showNightMode) {this.runningTime += deltaTime;this.horizonLine.update(deltaTime, currentSpeed);this.nightMode.update(showNightMode);this.updateClouds(deltaTime, currentSpeed);if (updateObstacles) {this.updateObstacles(deltaTime, currentSpeed);}},updateClouds: function (deltaTime, speed) {var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;var numClouds = this.clouds.length;if (numClouds) {for (var i = numClouds - 1; i >= 0; i--) {this.clouds[i].update(cloudSpeed);}var lastCloud = this.clouds[numClouds - 1];if (numClouds < this.config.MAX_CLOUDS &&(this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&this.cloudFrequency > Math.random()) {this.addCloud();}this.clouds = this.clouds.filter(function (obj) {return !obj.remove;});} else {this.addCloud();}},updateObstacles: function (deltaTime, currentSpeed) {// Obstacles, move to Horizon layer.var updatedObstacles = this.obstacles.slice(0);for (var i = 0; i < this.obstacles.length; i++) {var obstacle = this.obstacles[i];obstacle.update(deltaTime, currentSpeed);// Clean up existing obstacles.if (obstacle.remove) {updatedObstacles.shift();}}this.obstacles = updatedObstacles;if (this.obstacles.length > 0) {var lastObstacle = this.obstacles[this.obstacles.length - 1];if (lastObstacle && !lastObstacle.followingObstacleCreated &&lastObstacle.isVisible() &&(lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <this.dimensions.WIDTH) {this.addNewObstacle(currentSpeed);lastObstacle.followingObstacleCreated = true;}} else {// Create new obstacles.this.addNewObstacle(currentSpeed);}},removeFirstObstacle: function () {this.obstacles.shift();},addNewObstacle: function (currentSpeed) {var obstacleTypeIndex = getRandomNum(0, Obstacle.types.length - 1);var obstacleType = Obstacle.types[obstacleTypeIndex];if (this.duplicateObstacleCheck(obstacleType.type) || currentSpeed < obstacleType.minSpeed) {this.addNewObstacle(currentSpeed);} else {var obstacleSpritePos = this.spritePos[obstacleType.type];this.obstacles.push(new Obstacle(this.ctx, obstacleType, obstacleSpritePos, this.dimensions,this.gapCoefficient, currentSpeed, obstacleType.width));this.obstacleHistory.unshift(obstacleType.type);}if (this.obstacleHistory.length > 1) {this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);}},duplicateObstacleCheck: function (nextObstacleType) {var duplicateCount = 0;for (var i = 0; i < this.obstacleHistory.length; i++) {duplicateCount = this.obstacleHistory[i] == nextObstacleType ? duplicateCount + 1 : 0;}return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;},reset: function () {this.obstacles = [];this.horizonLine.reset();this.nightMode.reset();},resize: function (width, height) {this.canvas.width = width;this.canvas.height = height;},addCloud: function () {this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD, this.dimensions.WIDTH));}};Obstacle.MAX_GAP_COEFFICIENT = 1.5;Obstacle.MAX_OBSTACLE_LENGTH = 3;Obstacle.types = [{type: 'CACTUS_SMALL',width: 17,height: 35,yPos: 105,multipleSpeed: 4,minGap: 120,minSpeed: 0,collisionBoxes: [new CollisionBox(0, 7, 5, 27),new CollisionBox(4, 0, 6, 34),new CollisionBox(10, 4, 7, 14)]},{type: 'CACTUS_LARGE',width: 25,height: 50,yPos: 90,multipleSpeed: 7,minGap: 120,minSpeed: 0,collisionBoxes: [new CollisionBox(0, 12, 7, 38),new CollisionBox(8, 0, 7, 49),new CollisionBox(13, 10, 10, 38)]},{type: 'PTERODACTYL',width: 46,height: 40,yPos: [100, 75, 50], // Variable height. 高、中、低三种高度yPosMobile: [100, 50], // Variable height mobile.multipleSpeed: 999,minSpeed: 8.5,minGap: 150,collisionBoxes: [new CollisionBox(15, 15, 16, 5),new CollisionBox(18, 21, 24, 6),new CollisionBox(2, 14, 4, 3),new CollisionBox(6, 10, 4, 7),new CollisionBox(10, 8, 6, 9)],numFrames: 2,frameRate: 1000 / 6,speedOffset: .8}];function Obstacle(ctx, type, spriteImgPos, dimensions, gapCoefficient, speed, opt_xOffset) {this.ctx = ctx;this.spritePos = spriteImgPos;//障碍物类型(仙人掌、翼龙)this.typeConfig = type;this.gapCoefficient = gapCoefficient;this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);this.dimensions = dimensions;this.remove = false;this.xPos = dimensions.WIDTH + (opt_xOffset || 0);this.yPos = 0;this.width = 0;this.collisionBoxes = [];this.gap = 0;this.speedOffset = 0;// For animated obstacles.this.currentFrame = 0;this.timer = 0;this.init(speed);}Obstacle.prototype = {init: function (speed) {this.cloneCollisionBoxes();//若multipleSpeed大于移动速度，则只出现一个障碍物if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {this.size = 1;}this.width = this.typeConfig.width * this.size;if (Array.isArray(this.typeConfig.yPos)) {var yPosConfig = this.typeConfig.yPos;this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];} else {this.yPos = this.typeConfig.yPos;}this.draw();if (this.size > 1) {this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -this.collisionBoxes[2].width;this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;}if (this.typeConfig.speedOffset) {this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :-this.typeConfig.speedOffset;}this.gap = this.getGap(this.gapCoefficient, speed);},draw: function () {var sourceWidth = this.typeConfig.width;var sourceHeight = this.typeConfig.height;var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1)) +this.spritePos.x;// Animation frames.if (this.currentFrame > 0) {sourceX += sourceWidth * this.currentFrame;}this.ctx.drawImage(imgSprite,sourceX, this.spritePos.y,sourceWidth * this.size, sourceHeight,this.xPos, this.yPos,sourceWidth * this.size, sourceHeight);},update: function (deltaTime, speed) {if (!this.remove) {if (this.typeConfig.speedOffset) {speed += this.speedOffset;}this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);// Update frameif (this.typeConfig.numFrames) {this.timer += deltaTime;if (this.timer >= this.typeConfig.frameRate) {this.currentFrame = this.currentFrame == this.typeConfig.numFrames - 1 ? 0 : this.currentFrame + 1;this.timer = 0;}}this.draw();if (!this.isVisible()) {this.remove = true;}}},getGap: function (gapCoefficient, speed) {var minGap = Math.round(this.width * speed +this.typeConfig.minGap * gapCoefficient);var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);return getRandomNum(minGap, maxGap);},isVisible: function () {return this.xPos + this.width > 0;},cloneCollisionBoxes: function () {var collisionBoxes = this.typeConfig.collisionBoxes;for (var i = collisionBoxes.length - 1; i >= 0; i--) {this.collisionBoxes[i] = new CollisionBox(collisionBoxes[i].x,collisionBoxes[i].y, collisionBoxes[i].width,collisionBoxes[i].height);}}};DistanceMeter.dimensions = {WIDTH: 10,HEIGHT: 13,DEST_WIDTH: 11};DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];DistanceMeter.config = {// Number of digits.MAX_DISTANCE_UNITS: 5,// Distance that causes achievement animation.ACHIEVEMENT_DISTANCE: 100,// Used for conversion from pixel distance to a scaled unit.COEFFICIENT: 0.025,// Flash duration in milliseconds.FLASH_DURATION: 1000 / 4,// Flash iterations for achievement animation.FLASH_ITERATIONS: 3};function DistanceMeter(canvas, spritePos, canvasWidth) {this.canvas = canvas;this.ctx = canvas.getContext('2d');this.image = imgSprite;this.spritePos = spritePos;this.x = 0;this.y = 5;this.currentDistance = 0;this.maxScore = 0;this.highScore = 0;this.container = null;this.digits = [];this.acheivement = false;this.defaultString = '';this.flashTimer = 0;this.flashIterations = 0;this.invertTrigger = false;this.config = DistanceMeter.config;this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;this.init(canvasWidth);}DistanceMeter.prototype = {init: function (width) {var maxDistanceStr = '';this.calcXPos(width);this.maxScore = this.maxScoreUnits;for (var i = 0; i < this.maxScoreUnits; i++) {this.draw(i, 0);this.defaultString += '0';maxDistanceStr += '9';}this.maxScore = parseInt(maxDistanceStr);},calcXPos: function (canvasWidth) {this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *(this.maxScoreUnits + 1));},draw: function (digitPos, value, opt_highScore) {var sourceWidth = DistanceMeter.dimensions.WIDTH;var sourceHeight = DistanceMeter.dimensions.HEIGHT;var sourceX = DistanceMeter.dimensions.WIDTH * value;var sourceY = 0;var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;var targetY = this.y;var targetWidth = DistanceMeter.dimensions.WIDTH;var targetHeight = DistanceMeter.dimensions.HEIGHT;sourceX += this.spritePos.x;sourceY += this.spritePos.y;this.ctx.save();if (opt_highScore) {// Left of the current score.var highScoreX = this.x - (this.maxScoreUnits * 2) *DistanceMeter.dimensions.WIDTH;this.ctx.translate(highScoreX, this.y);} else {this.ctx.translate(this.x, this.y);}this.ctx.drawImage(this.image, sourceX, sourceY,sourceWidth, sourceHeight,targetX, targetY,targetWidth, targetHeight);this.ctx.restore();},getActualDistance: function (distance) {return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;},update: function (deltaTime, distance) {var paint = true;var playSound = false;if (!this.acheivement) {distance = this.getActualDistance(distance);// Score has gone beyond the initial digit count.if (distance > this.maxScore && this.maxScoreUnits == this.config.MAX_DISTANCE_UNITS) {this.maxScoreUnits++;this.maxScore = parseInt(this.maxScore + '9');} else {this.distance = 0;}if (distance > 0) {// Acheivement unlockedif (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {// Flash score and play sound.this.acheivement = true;this.flashTimer = 0;playSound = true;}// Create a string representation of the distance with leading 0.var distanceStr = (this.defaultString +distance).substr(-this.maxScoreUnits);this.digits = distanceStr.split('');} else {this.digits = this.defaultString.split('');}} else {// Control flashing of the score on reaching acheivement.if (this.flashIterations <= this.config.FLASH_ITERATIONS) {this.flashTimer += deltaTime;if (this.flashTimer < this.config.FLASH_DURATION) {paint = false;} else if (this.flashTimer >this.config.FLASH_DURATION * 2) {this.flashTimer = 0;this.flashIterations++;}} else {this.acheivement = false;this.flashIterations = 0;this.flashTimer = 0;}}// Draw the digits if not flashing.if (paint) {for (var i = this.digits.length - 1; i >= 0; i--) {this.draw(i, parseInt(this.digits[i]));}}this.drawHighScore();return playSound;},drawHighScore: function () {this.ctx.save();this.ctx.globalAlpha = .8;for (var i = this.highScore.length - 1; i >= 0; i--) {this.draw(i, parseInt(this.highScore[i], 10), true);}this.ctx.restore();},setHighScore: function (distance) {distance = this.getActualDistance(distance);var highScoreStr = (this.defaultString +distance).substr(-this.maxScoreUnits);this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));},reset: function () {this.update(0);this.acheivement = false;}};/*** 碰撞检测盒子* @param x    {number} x坐标* @param y {number} y坐标* @param w    {number} 宽度* @param h    {number} 高度*/function CollisionBox(x, y, w, h) {this.x = x;this.y = y;this.width = w;this.height = h;}function checkForCollision(obstacle, tRex, opt_canvasCtx) {var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;var tRexBox = new CollisionBox(tRex.xPos + 1,tRex.yPos + 1,tRex.config.WIDTH - 2,tRex.config.HEIGHT - 2);var obstacleBox = new CollisionBox(obstacle.xPos + 1,obstacle.yPos + 1,obstacle.typeConfig.width * obstacle.size - 2,obstacle.typeConfig.height - 2);if (opt_canvasCtx) {drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);}if (boxCompare(tRexBox, obstacleBox)) {var collisionBoxes = obstacle.collisionBoxes;var tRexCollisionBoxes = tRex.ducking ?Trex.collisionBoxes.DUCKING : Trex.collisionBoxes.RUNNING;for (var t = 0; t < tRexCollisionBoxes.length; t++) {for (var i = 0; i < collisionBoxes.length; i++) {// Adjust the box to actual positions.var adjTrexBox =createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);var adjObstacleBox =createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);var crashed = boxCompare(adjTrexBox, adjObstacleBox);// Draw boxes for debug.if (opt_canvasCtx) {drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);}if (crashed) {return [adjTrexBox, adjObstacleBox];}}}}return false;}function createAdjustedCollisionBox(box, adjustment) {return new CollisionBox(box.x + adjustment.x,box.y + adjustment.y,box.width,box.height);}function boxCompare(tRexBox, obstacleBox) {var crashed = false;var tRexBoxX = tRexBox.x;var tRexBoxY = tRexBox.y;var obstacleBoxX = obstacleBox.x;var obstacleBoxY = obstacleBox.y;// Axis-Aligned Bounding Box method.if (tRexBox.x < obstacleBoxX + obstacleBox.width &&tRexBox.x + tRexBox.width > obstacleBoxX &&tRexBox.y < obstacleBox.y + obstacleBox.height &&tRexBox.height + tRexBox.y > obstacleBox.y) {crashed = true;}return crashed;}function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {canvasCtx.save();canvasCtx.lineWidth = 0.5;canvasCtx.strokeStyle = '#f00';canvasCtx.strokeRect(tRexBox.x + 0.5, tRexBox.y + 0.5, tRexBox.width, tRexBox.height);canvasCtx.strokeStyle = '#0f0';canvasCtx.strokeRect(obstacleBox.x + 0.5, obstacleBox.y + 0.5,obstacleBox.width, obstacleBox.height);canvasCtx.restore();}Trex.config = {DROP_VELOCITY: -5,   //下落速度GRAVITY: 0.6, //重力HEIGHT: 47, //站立时高度HEIGHT_DUCK: 25, //闪躲时高度INIITAL_JUMP_VELOCITY: -10,//初始起跳速度INTRO_DURATION: 1500,MAX_JUMP_HEIGHT: 30, //最大起跳高度MIN_JUMP_HEIGHT: 30,    //最小起跳高度SPEED_DROP_COEFFICIENT: 3,SPRITE_WIDTH: 262,    //雪碧图霸王龙部分的宽度(不包含闪避动作)START_X_POS: 50,  //在画布的起始位置WIDTH: 44,        //站立时宽度WIDTH_DUCK: 59   //闪避时宽度};Trex.status = {CRASHED: 'CRASHED',  //碰到障碍物DUCKING: 'DUCKING',    //闪避JUMPING: 'JUMPING',   //跳跃RUNNING: 'RUNNING',   //跑动WAITING: 'WAITING'    //等待};Trex.BLINK_TIMING = 3000;Trex.collisionBoxes = {DUCKING: [new CollisionBox(1, 18, 55, 25)],RUNNING: [new CollisionBox(22, 0, 17, 16),new CollisionBox(1, 18, 30, 9),new CollisionBox(10, 35, 14, 8),new CollisionBox(1, 24, 29, 5),new CollisionBox(5, 30, 21, 4),new CollisionBox(9, 34, 15, 4)]};Trex.animFrames = {WAITING: {frames: [44, 0],msPerFrame: 1000 / 3},RUNNING: {frames: [88, 132],msPerFrame: 1000 / 12},CRASHED: {frames: [220],msPerFrame: 1000 / 60},JUMPING: {frames: [0],msPerFrame: 1000 / 60},DUCKING: {frames: [262, 321],msPerFrame: 1000 / 8}};function Trex(canvas, spritePos) {this.canvas = canvas;this.ctx = canvas.getContext('2d');this.spritePos = spritePos;this.xPos = 0;this.yPos = 0;//站立时的Y轴坐标this.groundYPos = 0;this.currentFrame = 0;this.currentAnimFrames = [];this.blinkDelay = 0;this.animStartTime = 0;this.timer = 0;this.msPerFrame = 1000 / FPS;this.config = Trex.config;//当前的动作为等待状态this.status = Trex.status.WAITING;this.jumping = false;    //是否跳跃this.ducking = false;    //是否闪避this.jumpVelocity = 0;this.reachedMinHeight = false;this.speedDrop = false;this.jumpCount = 0;this.jumpspotX = 0;    //空降着陆点this.init();}Trex.prototype = {init: function () {this.blinkDelay = this.setBlinkDelay();this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -Runner.config.BOTTOM_PAD;this.yPos = this.groundYPos;this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;this.draw(0, 0);this.update(0, Trex.status.WAITING);},setJumpVelocity: function (setting) {this.config.INIITAL_JUMP_VELOCITY = -setting;this.config.DROP_VELOCITY = -setting / 2;},update: function (deltaTime, opt_status) {this.timer += deltaTime;if (opt_status) {this.status = opt_status;this.currentFrame = 0;this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;this.currentAnimFrames = Trex.animFrames[opt_status].frames;if (opt_status == Trex.status.WAITING) {this.animStartTime = getTimeStamp();this.setBlinkDelay();}}if (this.playingIntro && this.xPos < this.config.START_X_POS) {this.xPos += Math.round((this.config.START_X_POS /this.config.INTRO_DURATION) * deltaTime);}if (this.status == Trex.status.WAITING) {this.blink(getTimeStamp());} else {this.draw(this.currentAnimFrames[this.currentFrame], 0);}if (this.timer >= this.msPerFrame) {this.currentFrame = this.currentFrame == this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;this.timer = 0;}if (this.speedDrop && this.yPos == this.groundYPos) {this.speedDrop = false;this.setDuck(true);}},setBlinkDelay: function () {this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);},blink: function (time) {var deltaTime = time - this.animStartTime;if (deltaTime >= this.blinkDelay) {this.draw(this.currentAnimFrames[this.currentFrame], 0);if (this.currentFrame == 1) {// Set new random delay to blink.this.setBlinkDelay();this.animStartTime = time;}}},startJump: function (speed) {if (!this.jumping) {this.update(0, Trex.status.JUMPING);this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY - (speed / 10);this.jumping = true;this.reachedMinHeight = false;this.speedDrop = false;}},endJump: function () {if (this.reachedMinHeight && this.jumpVelocity < this.config.DROP_VELOCITY) {this.jumpVelocity = this.config.DROP_VELOCITY;}},updateJump: function (deltaTime, speed) {var msPerFrame = Trex.animFrames[this.status].msPerFrame;var framesElapsed = deltaTime / msPerFrame;if (this.speedDrop) {this.yPos += Math.round(this.jumpVelocity *this.config.SPEED_DROP_COEFFICIENT * framesElapsed);} else {this.yPos += Math.round(this.jumpVelocity * framesElapsed);}this.jumpVelocity += this.config.GRAVITY * framesElapsed;if (this.yPos < this.minJumpHeight || this.speedDrop) {this.reachedMinHeight = true;}if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {this.endJump();}if (this.yPos > this.groundYPos) {this.reset();this.jumpCount++;}this.update(deltaTime);},setSpeedDrop: function () {this.speedDrop = true;this.jumpVelocity = 1;},setDuck: function (isDucking) {if (isDucking && this.status != Trex.status.DUCKING) {this.update(0, Trex.status.DUCKING);this.ducking = true;} else if (this.status == Trex.status.DUCKING) {this.update(0, Trex.status.RUNNING);this.ducking = false;}},draw: function (x, y) {var sourceX = x;var sourceY = y;var sourceWidth = this.ducking && this.status != Trex.status.CRASHED ?this.config.WIDTH_DUCK : this.config.WIDTH;var sourceHeight = this.config.HEIGHT;sourceX += this.spritePos.x;sourceY += this.spritePos.y;if (this.ducking && this.status != Trex.status.CRASHED) {this.ctx.drawImage(imgSprite, sourceX, sourceY,sourceWidth, sourceHeight,this.xPos, this.yPos,this.config.WIDTH_DUCK, this.config.HEIGHT);} else {if (this.ducking && this.status == Trex.status.CRASHED) {this.xPos++;}this.ctx.drawImage(imgSprite, sourceX, sourceY,sourceWidth, sourceHeight,this.xPos, this.yPos,this.config.WIDTH, this.config.HEIGHT);}},reset: function () {this.yPos = this.groundYPos;this.jumpVelocity = 0;this.jumping = false;this.ducking = false;this.update(0, Trex.status.RUNNING);this.midair = false;this.speedDrop = false;this.jumpCount = 0;}};var now = getTimeStamp();//不写onload方法就显示不出图片window.onload = function () {var runner = new Runner('.interstitial-wrapper');};
</script></html>
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