<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> #div1 {width: 100px; height: 100px; background: red; position: absolute;} #img1 { position: absolute;} </style> <script> window.onload = function() { var oDiv = document.getElementById(‘div1‘); var oImg = document.getElementById(‘img1‘); drag(oImg); drag(oDiv); function drag(obj) { obj.onmousedown = function(ev) { var ev = ev || event; var disX = ev.clientX - this.offsetLeft; var disY = ev.clientY - this.offsetTop; if ( obj.setCapture ) { obj.setCapture(); } document.onmousemove = function(ev) { var ev = ev || event; obj.style.left = ev.clientX - disX + ‘px‘; obj.style.top = ev.clientY - disY + ‘px‘; } document.onmouseup = function() { document.onmousemove = document.onmouseup = null; //释放全局捕获 releaseCapture(); if ( obj.releaseCapture ) { obj.releaseCapture(); } } return false; } } } </script> </head> <body> <div id="div1"></div> <img src="1.jpg" id="img1" /> </body> </html>
原文：http://www.cnblogs.com/nifengs/p/4977517.html