本文實例講述了jQuery實現右下角可縮放大小的層。分享給大家供大家參考，具體如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>大小可縮放層測試</title>
<script type = "text/javascript" src="jquery-1.7.2.js"></script>
<style type = "text/css">
#fa{
border:1px solid blue;
overflow:auto;
width:400px;
height:400px;
}
#main{
margin:0;
padding:0;
width:300px;
height:280px;
border:1px solid red;
}
</style>
<script type = "text/javascript">
$(function(){
var div = getObj("main");
div.onmousemove = function(e){
var e = e || window.event;
var posx = e.clientX;
var posy = e.clientY;
var l = div.offsetLeft;
var t = div.offsetTop;
var h = div.clientHeight;
var w = div.clientWidth;
var ol = l+w-10;
var or = l+w+10;
var ot = t+h-10;
var ob = t+h+10;
this.style.cursor = "";
if(posx>ol && posx<or && posy >ot && posy<ob){
div.style.cursor = "nw-resize";
}
}
div.onmousedown = function(e){
var e = e || window.event;
var initX = e.clientX;
var initY = e.clientY;
var l = div.offsetLeft;
var t = div.offsetTop;
var h = div.clientHeight;
var w = div.clientWidth;
var ol = l+w-10;
var or = l+w+10;
var ot = t+h-10;
var ob = t+h+10;
if(initX>ol && initX<or && initY >ot && initY<ob){
document.onmousemove = function(evt){
var e = evt || window.event;
var currX = e.clientX;
var currY = e.clientY;
div.style.width = w + (currX - initX)+"px";
div.style.height = h+(currY-initY)+"px";
}
document.onmouseup = function(){
document.onmousemove = null;
document.onmouseup = null;
}
}
}
});
function getObj(id){
return document.getElementById(id);
}
</script>
</head>
<body>
<div id = "fa">
<div id = "main"></div>
</div>
</body>
</html>
函數封裝後：
function resize(div){
div.mousemove(function(e){
var e = e || window.event;
var posx = e.clientX;
var posy = e.clientY;
var l = div.offset().left;
var t = div.offset().top;
var h = div.height();
var w = div.width();
var ol = l+w-10;
var or = l+w+10;
var ot = t+h-10;
var ob = t+h+10;
$(this).css("cursor","");
if(posx>ol && posx<or && posy >ot && posy<ob){
$(this).css("cursor","nw-resize");
}
});
div.mousedown(function(e){
var e = e || window.event;
var posx = e.clientX;
var posy = e.clientY;
var l = div.offset().left;
var t = div.offset().top;
var h = div.height();
var w = div.width();
var ol = l+w-10;
var or = l+w+10;
var ot = t+h-10;
var ob = t+h+10;
if(posx>=ol && posx<=or && posy >=ot && posy<=ob){
document.onmousemove = function(e){
var e = e || window.event;
var currX = e.clientX;
var currY = e.clientY;
div.width(w + (currX - posx));
div.height(h+(currY-posy));
}
$(document).mouseup(function(){
document.onmousemove = null;
});
}
});
}