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var xmlhttp;
function verify() {
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    var userName = document.getElementById("userName").value;
    //1.´´½¨XMLHttpRequest¶ÔÏó
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    //ÐèÒªÕë¶ÔIEºÍÆäËûÀàÐ͵Ää¯ÀÀÆ÷½¨Á¢Õâ¸ö¶ÔÏóµÄ²»Í¬·½Ê½Ð´²»Í¬µÄ´úÂë
    if (window.XMLHttpRequest) {
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        xmlhttp = new XMLHttpRequest();
        //Õë¶ÔÄ³Ð©ÌØ¶¨°æ±¾µÄmozillarä¯ÀÀÆ÷µÄBUG½øÐÐÐÞÕý
        if (xmlhttp.overrideMimeType) {
            xmlhttp.overrideMimeType("text/xml");
        }
    } else if (window.ActiveXObject) {
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        var activexName = ["MSXML2.XMLHTTP","Microsoft.XMLHTTP"];
        for (var i = 0; i < activexName.length; i++) {
            try{
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3 mistakes to avoid when using jQuery with ASP.NET AJAX
AJAX, ASP.NET, JavaScript, jQuery By Dave Ward on June 5th, 2008
Over the past few weeks, I think I have definitely embodied Jeff Atwood’s claim that we’re all amateurs, learning together. Despite my best efforts to thoroughly tes ......

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