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iframe高度自适应终极解决办法

JavaScript,HTML
function initIframeHeight(height){
    var userAgent = navigator.userAgent;
    var iframe = parent.document.getElementById("contentIframe");
    var subdoc = iframe.contentDocument || iframe.contentWindow.document;
    var subbody = subdoc.body;
    var realHeight;
    //谷歌浏览器特殊处理
    if(userAgent.indexOf("Chrome") > -1){
        realHeight = subdoc.documentElement.scrollHeight;
    }
    else{
        realHeight = subbody.scrollHeight;
    }
    if(realHeight < height){
        $(iframe).height(height);
    }
    else{
        $(iframe).height(realHeight);
    }
}
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