js根据url获取网页内容

function GetIframeInnerHtml(objIFrame)
{
        var iFrameHTML = "";
        if (objIFrame.contentDocument)
        {
                // For NS6
                iFrameHTML = objIFrame.contentDocument.innerHTML;   
        }   
        else if (objIFrame.contentWindow)   
        {
                // For IE5.5 and IE6
                iFrameHTML = objIFrame.contentWindow.document.body.innerHTML;
        }   
        else if (objIFrame.document)   
        {
                // For IE5
                iFrameHTML = objIFrame.document.body.innerHTML;
        }
   
        return iFrameHTML;
}
<iframe src="http://www.baidu.com/" id="frmIn" name="frmIn" scrolling="no" width="450" height="450"></iframe>

原文地址：http://katrina.blog.51cto.com/709863/143636