核心代码：
<！doctype html> <html xmlns =“ http://www.w3.org/1999/xhtml”> <head> <head> <meta http-equiv =“ content-equiv =“ content-type” content =“ text/html; charse =“ text/html; charset = utf-8” /> <title>鼠标拖动和拖拽的鼠标指针特效</title> <样式> #box {width：100px;高度：100px;背景：＃966;位置：绝对;左：100px; top：100px; curesor：curesor：pointer;} </style> </style> </style> </head> <body> <body> <body> <body> <body> <body> <div id = {width：Math.max（document.documentElement.ClientWidth，document.documentElement.scrollwidth），身高：Math.max（document.documentElement.Client.ClientHeight，document.documentElement.documentElement.scrollheight）};} x <minnum：x = minnum; break;案例X> maxnum：x = maxnum; break;默认值：x; }返回x; } box.style.left ='100px'box.style.top ='100px'box.onmousedown = function（e）{var e = e || window.event; var maxl = getViewPort（）。width-100，maxt = getViewport（）。高度100; this.startl = parseint（this.style.left）; this.startt = parseint（this.style.top）; // alert(e.clientx）this.startx = e.clientx; this.starty = e.clienty; // alert（maxl+'：'+maxt+'：'+l+'：'+t）doc.onmousemove = function（e）{posxy（e，0,0，maxl，maxt）; }; doc.onmouseup = function（）{doc.onmousemove = null; doc.onmouseup = null; };返回false;}函数posxy（e，minl，mint，maxl，maxt）{var e = e || window.event; var x = box.startl-（box.startx-e.clientx）; var y = box.startt-（box.starty-e.clienty）; Box.Style.left = compareNum（x，minl，maxl）+'px'box.style.top = compareNum（y，mint，mint，maxt）+'px'} </script> </script> </script> </body> </hody> </html>[ctrl+a全选：如需引入外部js需刷新才能执行]