核心代码 ：
<! Doctype html> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <meta http-equiv = "content-type" content = "text/html; charset = utf-8" /> <Title> 鼠标拖动和拖拽的鼠标指针特效 </title> <style> #box {width: 100px; высота: 100px; фон:#966; Положение: абсолют; слева: 100px; top: 100px; cursor: pointer;} </style> </head> <body> <div id = box "> </div> var doc = document. {width: math.max (document.documentelement.clientwidth, document.documentelement.scrollwidth), высота: math.max (document.documentelement.clientHeight, document.documentelement.scrollheight (True) x <minnum: x = minnum; break; Случай x> maxnum: x = maxnum; break; по умолчанию: x; } return 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 (). Height-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; }; вернуть false;} функция 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, maxt)+'px'} </script> </body> </html>[Ctrl+a 全选 注: 如需引入外部 JS 需刷新才能执行]