jquery对div的移动以及改变大小

<html>

<head>
<title>拖动鼠标改变div层的大小宽度</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<style>
{
box-sizing: border-box;
moz-box-sizing: border-box
}

#testDiv {
   background-color: buttonface;
   background-repeat: repeat;
   background-attachment: scroll;
   color: #3969A5;
   height: 300px;
   left: 30px;
   overflow: hidden;
   width: 500;
   z-index: 2;
   border: 2px outset white;
   margin: 0px;
   padding: 2px;
   background-position: 0% 50%
}

body {
font-family: Verdana;
font-size: 9pt
}

#innerNice {
   background-color: white;
   background-repeat: repeat;
   background-attachment: scroll;
   color: #3969A5;
   height: 90%;
   width: 100%;
   overflow: auto;
   border: 2px inset white;
   padding: 8px;
   background-position: 0% 50%;
   margin-top: 10%;
}

.drag {
   position: absolute;
   background: #0000CC;
   top: 100px;
   left: 200px;
   padding: 0;
   height: 1;
   width: 1;
}
</style>

<div id="innerNice">
<p align="center">　</p>
<p align="center">
请在边框处拖动鼠标
<p>　</p>
<p>　</p>
<p>　</p>
<p align="center">~~~~~~~~~~~~</p>
</div>
</div>
</div>

</body>
<script type="text/javascript" src="jquery.min.js"></script>
<script>

var theobject = null; //This gets a value as soon as a resize start
var remove=false;
function resizeObject() {
this.el= null; //pointer to the object
this.dir = ""; //type of current resize (n, s, e, w, ne, nw, se, sw)
this.grabx = null; //Some useful values
this.graby = null;
this.width = null;
this.height = null;
this.left = null;
this.top = null;
}

//Find out what kind of resize! Return a string inlcluding the directions
function getDirection(el) {
var xPos, yPos, offset, dir;
dir = "";

xPos = window.event.offsetX;
yPos = window.event.offsetY;

offset = 8; //The distance from the edge in pixels

if (yPos<offset) dir += "n";
else if (yPos > el.offsetHeight-offset) dir += "s";
if (xPos<offset) dir += "w";
else if (xPos > el.offsetWidth-offset) dir += "e";

return dir;
}

function doDown() {
var el = getReal(event.srcElement, "className", "resizeMe");

if (el == null) {
theobject = null;
return;
}

dir = getDirection(el);
if (dir == "") return;
remove = false;
theobject = new resizeObject();

theobject.el = el;
theobject.dir = dir;

theobject.grabx = window.event.clientX;
theobject.graby = window.event.clientY;
theobject.width = el.offsetWidth;
theobject.height = el.offsetHeight;
theobject.left = el.offsetLeft;
theobject.top = el.offsetTop;

window.event.returnValue = false;
window.event.cancelBubble = true;
}

function doUp() {
if (theobject != null) {
theobject = null;
}
remove = true;
}

function doMove() {
var el, xPos, yPos, str, xMin, yMin;
xMin = 8; //The smallest width possible
yMin = 8; // height

el = getReal(event.srcElement, "className", "resizeMe");

if (el.className == "resizeMe") {
str = getDirection(el);
//Fix the cursor
if (str == "") str = "default";
else str += "-resize";
el.style.cursor = str;
}

//Dragging starts here
if(theobject != null) {
if (dir.indexOf("e") != -1)
theobject.el.style.width = Math.max(xMin, theobject.width + window.event.clientX - theobject.grabx) + "px";

if (dir.indexOf("s") != -1)
theobject.el.style.height = Math.max(yMin, theobject.height + window.event.clientY - theobject.graby) + "px";

if (dir.indexOf("w") != -1) {
theobject.el.style.left = Math.min(theobject.left + window.event.clientX - theobject.grabx, theobject.left + theobject.width - xMin) + "px";
theobject.el.style.width = Math.max(xMin, theobject.width - window.event.clientX + theobject.grabx) + "px";
}
if (dir.indexOf("n") != -1) {
theobject.el.style.top = Math.min(theobject.top + window.event.clientY - theobject.graby, theobject.top + theobject.height - yMin) + "px";
theobject.el.style.height = Math.max(yMin, theobject.height - window.event.clientY + theobject.graby) + "px";
}

window.event.returnValue = false;
window.event.cancelBubble = true;
}
}

document.onmousedown = doDown;
document.onmouseup = doUp;
document.onmousemove = doMove;

$(".drag").ready(function(){

var _x,_y;
$(".drag").mousedown(function(e){
move=true;
_x=e.pageX-parseInt($(".drag").css("left"));
_y=e.pageY-parseInt($(".drag").css("top"));
});
$(document).mousemove(function(e){
if(move&&remove){
var x=e.pageX-_x;//控件左上角到屏幕左上角的相对位置
var y=e.pageY-_y;
$(".drag").css({"top":y,"left":x});
}
}).mouseup(function(){
move=false;
});
})

</script>
</html>

下载地址：https://download.csdn.net/download/sdf295953/10618749

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