//html代码部分
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="../js/jquery-1.11.1.js"></script>
</head>
<style>
body{
padding: 0;
margin: 0;
}
.w{
width: 600px;
height: 600px;
background-color: red;
position: absolute;
left: 0;
top: 0;
}
.a{
width: 600px;
height: 50px;
cursor: move;
background-color: yellowgreen;
position: absolute;
left: 0;
top:0;
}
</style>
<body>
<div class="w">
<div class="a"></div>
</div>
</body>
</html>
//需要拖动的部分需加上定位属性
//jquery代码部分
<script>
//鼠标拖拽效果
(function($){
$.fn.wwp_tz = function(opt){
var defaults = {
};
var options = $.extend({},defaults,opt);
this.each(function(){
var $this = $(this);
var L=0,T=0;
$this.mousedown(function(event){
$this.data("down","1");
var X = event.clientX; //获取当前鼠标的X轴;
var Y = event.clientY; //获取当前鼠标的Y轴;
var offset = $this.offset();
var box_x = offset.left; //获取当前元素的x轴浮动距离;
var box_y = offset.top; //获取当前元素的y轴浮动距离;
L = X-box_x; //当前鼠标到元素之间的距离;
T = Y-box_y;
}).mousemove(function(event){
if($this.data("down") == 1){
var X = event.clientX; //获取当前鼠标的X轴;
var Y = event.clientY; //获取当前鼠标的Y轴;
var box_left = X-L; //鼠标当前位置减去鼠标到元素的位置
var box_top = Y-T;
if(options.dom == 1){
$this.css({left:box_left+"px",top:box_top+"px"})
}else if(options.dom == 2){
$this.parent().css({left:box_left+"px",top:box_top+"px"})
}
}else{
return false;
}
}).mouseup(function(){ //鼠标抬起时
$this.data("down","-1");
}).mouseleave(function(){ //光标离开元素时
$this.data("down","-1");
});
})
}
})(jQuery);
//调用
$(function(){
$(".a").wwp_tz({
dom:2 // 1是元素自身拖动,2是含父节点一起拖动
})
});
</script>
原文：http://www.cnblogs.com/wangweipeng/p/4569006.html