脚本代码(For Alixixi.com)如下:

利用jquery实现简单拖曵原理实例 by js.alixixi.com

#drag{width:400px;height:300px;cursor:move;position:absolute;top:100px;left:100px;border:solid 1px #ccc;}

h2{color:#fff;background: none repeat scroll 0 0 rgba(16, 90, 31, 0.7);color:#FFFFFF;height:40px;line-height:40px;margin:0;}

$(function(){

/*--------------拖曳效果----------------

*原理：标记拖曳状态dragging ,坐标位置iX, iY

* mousedown:fn(){dragging = true, 记录起始坐标位置，设置鼠标捕获}

* mouseover:fn(){判断如果dragging = true, 则当前坐标位置 - 记录起始坐标位置，绝对定位的元素获得差值}

* mouseup:fn(){dragging = false, 释放鼠标捕获，防止冒泡}

*/

var dragging = false;

var iX, iY;

$("#drag").mousedown(function(e) {

dragging = true;

iX = e.clientX - this.offsetLeft;

iY = e.clientY - this.offsetTop;

this.setCapture && this.setCapture();

return false;

});

document.onmousemove = function(e) {

if (dragging) {

var e = e || window.event;

var oX = e.clientX - iX;

var oY = e.clientY - iY;

$("#drag").css({"left":oX + "px", "top":oY + "px"});

return false;

}

};

$(document).mouseup(function(e) {

dragging = false;

$("#drag")[0].releaseCapture();

e.cancelBubble = true;

})

})