效果如下：

代码如下：

canvas星座

* {

margin: 0;

padding: 0;

}

#box{

margin:10px 0 0 10px;;

}

input{

outline: none;

font-size:16px;

}

p{

margin-bottom: 10px

}

input[type=date]{

height:36px;

text-indent:10px;

}

input[type=button]{

background:#3A92FF;

color:white;

border: none;

height:40px;

padding:0 10px;

margin-left: -2px;

}

#canvas{

margin-left:10px;

background-color: #000;

display: none;

}

你的浏览器不支持canvas

var box=document.getElementById('box');

var birth=document.getElementById('birth');

var btn=document.getElementById('btn');

var canvas=document.getElementById("canvas");

var ctx=canvas.getContext("2d");

var g1,date,timer;

ctx.font = "30px Courier New";

/*星座位置*/

var star={

"白羊座":[

[[0.30,0.78],[0.34,0.66],[0.28,0.48],[0.60,0.26],[0.65,0.20],[0.71,0.23],[0.70,0.32],[0.72,0.36]],

[ [0,1,2,3,4,5],[3,6,7]]

],

"天秤座":[

[[0.16,0.67],[0.34,0.60],[0.60,0.27],[0.75,0.23],[0.84,0.47],[0.63,0.74],[0.51,0.78]],

[[0,1,2,3,4,5,6]]

],

"摩羯座":[

[[0.78,0.21],[0.78,0.34],[0.75,0.45],[0.75,0.70],[0.69,0.78],[0.31,0.66],[0.22,0.49],[0.30,0.53],[0.53,0.54]],

[[0,1,2,3,4,5,6,7,8,1]]

],

"水瓶座":[

[[0.45,0.21],[0.37,0.35],[0.27,0.51],[0.30,0.58],[0.29,0.64],[0.48,0.79],[0.51,0.71],[0.58,0.68],[0.73,0.74],[0.43,0.53],[0.53,0.47]],

[[0,1,2,3,4,5,6,7,8],[2,9,10]]

],

"双鱼座":[

[[0.28,0.43],[0.28,0.53],[0.36,0.73],[0.43,0.78],[0.50,0.70],[0.53,0.62],[0.57,0.58],[0.63,0.43],[0.67,0.39],[0.74,0.39],[0.77,0.34],[0.72,0.30],[0.75,0.22],[0.23,0.50],[0.66,0.33]],

[[0,1,2,3,4,5,6,7,8,9,10,11,12],[0,13,1],[8,14,11]]

],

"金牛座":[

[[0.29,0.21],[0.39,0.36],[0.50,0.51],[0.50,0.57],[0.61,0.63],[0.77,0.71],[0.79,0.79],[0.22,0.43],[0.39,0.57],[0.60,0.71],[0.67,0.76]],

[[0,1,2,3,4,5,6],[7,8,3],[4,9,10]]

],

"双子座":[

[[0.18,0.37],[0.25,0.45],[0.35,0.55],[0.39,0.68],[0.49,0.77],[0.51,0.63],[0.57,0.78],[0.28,0.29],[0.42,0.32],[0.61,0.49],[0.72,0.60],[0.83,0.59],[0.69,0.75],[0.22,0.54],[0.35,0.43],[0.48,0.21]],

[[0,1,2,3,4],[2,5,6],[7,8,9,10,11],[9,12],[13,1,14,8,15]]

],

"巨蟹座":[

[ [0.16,0.39],[0.27,0.36],[0.52,0.49],[0.57,0.65],[0.83,0.78],[0.44,0.21]],

[[0,1,2,3,4],[2,5]]

],

"狮子座":[

[

[0.16,0.75],[0.23,0.67],[0.39,0.77],[0.71,0.53],[0.64,0.39],[0.55,0.37],[0.47,0.27],[0.54,0.24],[0.60,0.27],[0.85,0.56]],

[[0,1,2,3,4,5,6,7,8],[3,9]]

],

"处女座":[

[[0.16,0.59],[0.35,0.63],[0.44,0.70],[0.62,0.51],[0.77,0.46],[0.84,0.37],[0.60,0.42],[0.65,0.26],[0.34,0.75]],

[[0,1,2,3,4,5],[3,6,7],[2,8]]

],

"天蝎座":[

[[0.17,0.50],[0.28,0.63],[0.19,0.70],[0.28,0.78],[0.41,0.77],[0.49,0.72],[0.57,0.55],[0.59,0.44],[0.69,0.31],[0.74,0.21],[0.82,0.29],[0.79,0.44],[0.73,0.50],[0.38,0.47]],

[[0,1,2,3,4,5,6,7,8,9,10,11,12],[1,13],[8,11]]

],

"射手座":[

[[0.22, 0.66],[0.24,0.51],[0.45,0.40],[0.54,0.37],[0.59,0.43],[0.66,0.50],[0.63,0.60],[0.66,0.67],[0.74,0.53],[0.77,0.39],[0.49,0.47],[0.29,0.68],[0.30,0.78],[0.48,0.21],[0.52,0.27],[0.59,0.29]],

[[0,1,2,3,4,5,6,7,8,9],[2,10,11,12],[10,4],[13,14,15,3],[14,3]]

]

};

/*根据出生日期获取星座信息*/

function getStarSign(ts){

var d=new Date(ts),sign=d.getMonth()*100+d.getDate();

switch(true)

{

case sign<20:

return "摩羯座";

case sign<119:

return "水瓶座";

case sign<221:

return "双鱼座";

case sign<320:

return "白羊座";

case sign<421:

return "金牛座";

case sign<522:

return "双子座";

case sign<623:

return "巨蟹座";

case sign<723:

return "狮子座";

case sign<823:

return "处女座";

case sign<923:

return "天秤座";

case sign<1022:

return "天蝎座";

case sign<1122:

return "射手座";

default:

return "摩羯座";

}

}

/*绘制星座*/

function constellation(ctx,ary,w,h){

/*创建线条*/

var points=ary[0], lines=ary[1];

ctx.strokeStyle="#FFF";

var len=lines.length,i,ii,line,point;

ctx.beginPath();

while(len--)

{

i=1;

line=lines[len];

ii=line.length;

point=points[line[0]];

ctx.moveTo(point[0]*w,point[1]*h);

for(;i

point=points[line[i]];

ctx.lineTo(point[0]*w,point[1]*h);

}

}

ctx.stroke();

/*创建小圆*/

var cur;

i=0;

ii=points.length;

for(;i

cur=points[i];

new Circle(cur[0]*w,cur[1]*h).draw();//new出实例

}

}

/*创建小圆的构造函数*/

function Circle(x,y,r){

this.x=x;

this.y=y;

this.r=r||Math.round(Math.random()*8+4);

}

Circle.prototype={

draw:function(){

ctx.beginPath();

g1=ctx.createRadialGradient(this.x,this.y,Math.round(Math.random()*1+1),this.x,this.y,Math.round(Math.random()*3+6));

g1.addColorStop(0,'rgba(255,255,255,.9)');

g1.addColorStop(1,'rgba(0,0,0,.1)');

ctx.arc(this.x,this.y,this.r,0,Math.PI*2,true);

ctx.fillStyle =g1;

ctx.closePath();

ctx.fill();

return this;

}};

/*点击‘展示我的星空图'按钮*/

btn.οnclick=function(e){

clearInterval(timer);

e.preventDefault();

if (!birth.value){

alert("请选择您的出生日期");

}else{

canvas.style.display="block";

date = new Date(birth.value.replace(/-/g,'/')).getTime();

timer=setInterval(function(){

ctx.clearRect(0,0,canvas.width,canvas.height);

ctx.strokeText(getStarSign(date), 50, 50);

constellation(ctx,star[getStarSign(date)],canvas.width,canvas.height);

},500);

}

};

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持编程圈！