IE7下连续两次alert怎么会不一样哪?

IE7下连续两次alert怎么会不一样哪? [已结帖,结帖人:lgzxz999]

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lgzxz999
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发表于：2008-11-09 16:33:36 楼主

IE7下textarea自适应高度的效果

HTML code


<!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>
</head>
<body>
<textarea id="content" style="width:100%;overflow-y:visible" readonly="readonly">
        I have to agree with Niall Doherty
        basically means "traverse every css element and give it these 
        attributes". That is a very unnecessary strain on the server and 
        a bad semantic practice, as you have to give some elements 
        padding/margin again, after stripping them.
        basically means "traverse every css element and give it these 
        attributes". That is a very unnecessary strain on the server and 
        a bad semantic practice, as you have to give some elements 
        padding/margin again, after stripping them.
        basically means "traverse every css element and give it these 
        attributes". That is a very unnecessary strain on the server and 
        a bad semantic practice, as you have to give some elements 
        padding/margin again, after stripping them.
</textarea>
<script language="javascript">
    document.getElementById("content").style.height = document.getElementById("content").scrollHeight + 10 + "px";
</script>
</body>
</html>

在IE7中没有达到预期的效果
但是,在JS中加入这样的代码就可以了

JScript code


<script language="javascript">
    alert(document.getElementById("content").scrollHeight);
    alert(document.getElementById("content").scrollHeight);
    document.getElementById("content").style.height = document.getElementById("content").scrollHeight + 10 + "px";
</script>

我想不明白,为什么两次alert会不一样那,请大家指点下啊

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