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  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>跟隨鼠標移動（大圖展示）</title> <style type="text/css"> html,body{overflow:hidden;} body,div,ul,li{margin:0;padding:0;} #box ul{width:768px;height:172px;list-style-type:none;margin:10px auto;} #box li{float:left;width:170px;height:170px;cursor:pointer;display:inline;border:1px solid #ddd;margin:0 10px;} #box li.active{border:1px solid #a10000;} #box li img{width:170px;height:170px;vertical-align:top;} #big{position:absolute;width:400px;height:400px;border:2px solid #ddd;display:none;} #big div{position:absolute;top:0;left:0;width:400px;height:400px;opacity:0.5;filter:alpha(opacity=50);background:#fff url(http://js.fgm.cc/learn/lesson5/img/loading.gif) 50% 50% no-repeat;} </style> <script type="text/javascript"> window.onload = function () { var aLi = document.getElementsByTagName("li"); var oBig = document.getElementById("big"); var oLoading = oBig.getElementsByTagName("div")[0]; var i = 0; for (i = 0; i < aLi.length; i++) { aLi[i].index = i; //鼠標劃過, 預加載圖片插入容器并顯示 aLi[i].onmouseover = function () { var oImg = document.createElement("img"); //圖片預加載 var img = new Image(); img.src = oImg.src = aLi[this.index].getElementsByTagName("img")[0].src.replace(".jpg","_big.jpg"); //插入大圖片 oBig.appendChild(oImg); //鼠標移過樣式 this.className = "active"; //顯示big oBig.style.display = oLoading.style.display = "block"; //判斷大圖是否加載成功 img.complete ? oLoading.style.display = "none" : (oImg.onload = function() {oLoading.style.display = "none";}) }; //鼠標移動, 大圖容器跟隨鼠標移動 aLi[i].onmousemove = function (event) { var event = event || window.event; var iWidth = document.documentElement.offsetWidth - event.clientX; //設置big的top值 oBig.style.top = event.clientY + 20 + "px"; //設置big的left值, 如果右側顯示區域不夠, 大圖將在鼠標左側顯示. oBig.style.left = (iWidth < oBig.offsetWidth + 10 ? event.clientX - oBig.offsetWidth - 10 : event.clientX + 10) + "px"; }; //鼠標離開, 刪除大圖并隱藏大圖容器 aLi[i].onmouseout = function () { this.className = ""; oBig.style.display = "none"; //移除大圖片 oBig.removeChild(oBig.lastChild) } } }; </script> </head> <body> <div class="wmvwfqqt" id="box"> <ul> <li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_1.jpg" /></li> <li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_2.jpg" /></li> <li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_3.jpg" /></li> <li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_4.jpg" /></li> </ul> </div> <div class="wmvwfqqt" id="big"><div></div></div> </body> </html>

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