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河北省服装技术学院
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河北省服装技术学院</div>
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首先，我说一下，上面的【字符串】（不是HTML）是来自：
在一个HTML网页中，用Ajax的get方式获取到一个网页，返回（用IE浏览器才能）的字符串就是上面的了。【难点】：上面的并不是HTML，所以无法使用DOM来取了，加上有换行等等的，那么怎样才能返回name="__VIEWSTATE" 的input里的value的值呢？【最终目的】返回input的value值，如上面的，正确应该返回：
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
e.innerHTML = s;
document.body.insertBefore(e,null);
alert(document.getElementsByName('__VIEWSTATE')[0].value);
谢谢版主的指点！
不过这样插入了一个元素，它显示在界面上了，可以增加一个隐藏属性么？不需要显示出来。这样可以了~~e = document.createElement('div');
e.style.display="none";
str.search(/id="__viewstate"\svalue="([^"]+)/i);
console.log(RegExp.$1);
这样插入一个元素会影响性能么？
因为我是这样用的，第隔几ms就要从服务器取一次数据，然后查找Viestate出来，不用正则来找出会否造成页面冗余呢？
<div id=buf style='display:none'></div>
每次取回的数据就放到它里面
document.getElementById('buf').innerHTML = s;对于你的应用，按理说返回的应该是 json 数据，而非 html 代码
嗯嗯，谢谢提醒！刚才对比试过了，由于我要取的数据是来自他人网站的，所以返回json由不得我控制了，呵呵。
出于这个原因，这里还是用正则来取好，刚才作了对比，如果先插入一个元素，再用DOM去取出来，会造成页面庞大，浏览器卡死状态。用正则不会出现这个问题~