#after{ 
position: absolute; 
top: 0px; 
left: 0px; 
background-image: url(../images/24.jpg); 
width: 940px; 
height: 529px; 
background-repeat: no-repeat; 
} 
#before{ 
position: absolute; 
top: 0px; 
left: 0px; 
border-right: 3px solid #f00; 
background-image: url(../images/23.jpg); 
width: 433px; 
height: 529px; 
background-repeat: no-repeat; 
max-width: 940px; 
}

這樣，圖片就在web上顯示出來了。

接下來實現(xiàn)卷簾效果。實現(xiàn)卷簾，最主要的是設(shè)置before的寬度，如何去設(shè)置呢，就是獲取鼠標(biāo)的位置，代碼如下：

function RollImage(evt){ 
var x=evt.pageX; 
console.log(x); 
$("#before").css("width",x+"px"); 
} 
/script>

這樣，卷簾的效果就實現(xiàn)了。源代碼如下：

style.css

.beforeafter{ 
width: 940px; 
height: 529px; 
} 
#after{ 
position: absolute; 
top: 0px; 
left: 0px; 
background-image: url(../images/24.jpg); 
width: 940px; 
height: 529px; 
background-repeat: no-repeat; 
} 
#before{ 
position: absolute; 
top: 0px; 
left: 0px; 
border-right: 3px solid #f00; 
background-image: url(../images/23.jpg); 
width: 433px; 
height: 529px; 
background-repeat: no-repeat; 
max-width: 940px; 
}

test.html

<html lang="zh-CN" xmlns="http://www.w3.org/1999/xhtml"><head> 
<title>日本地震災(zāi)區(qū)前后對比</title> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<meta http-equiv="Content-Language" content="zh-CN"> 
<link href="css/roll.css" type="text/css" rel="stylesheet"> 
<script src="../jquery-1.8.3.js" type="text/javascript" charset="utf-8"></script> 
<script type="text/javascript"> 
function RollImage(evt){ 
<strong>var x=evt.pageX; 
$("#before").css("width",x+"px");</strong> 
} 
</script> 
</head> 
<body> 
<div class="beforeafter" onmousemove="RollImage(event)"> 
<div id="after"></div> 
<div id="before"> </div> 
</div> 
</body> 
</html>

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