以下代码在ie8下运行通过，在ie9中出错：
复制代码 代码如下:
document.createelement('');
错误提示：exception : script5022: dom exception: invalid_character_err (5)思路分析：
第一步：兼容ie9，firefox，opera，safari等浏览器；
复制代码 代码如下:
var iframe = document.createelement(iframe);
iframe.setattribute(id, yui-history-iframe);
iframe.setattribute(src, ../../images/defaults/transparent-pixel.gif);
iframe.setattribute(style,position:absolute;top:0;left:0;width:1px;height:1px;visibility:hidden;);
第二步：兼容ie6-8：由于ie6-8 不能修改iframe的name属性
复制代码 代码如下:
var oframe = isie ? document.createelement() : document.createelement(iframe);
oframe.name = iframname;
综合解决办法:
复制代码 代码如下:
var isie = (document.all) ? true: false; //这里仅仅简单的对是否是ie进行判断，详细浏览器判断：请参考浏览器类型侦测
var ua = navigator.useragent.tolowercase().match(/msie ([/d.] + ) / )[1];
if (ua == 9.0) {
    isie = false;
}
var oframe = isie ? document.createelement() : document.createelement(iframe);oframe.name = iframname;
//=========================function ajaxpost(formid, showid, waitid, showidclass, submitbtn, recall) {
    var waitid = typeof waitid == 'undefined' || waitid === null ? showid : (waitid !== '' ? waitid : '');
    var showidclass = !showidclass ? '' : showidclass;
    var ajaxframeid = 'ajaxframe';
    var ajaxframe = $(ajaxframeid);
    var formtarget = $(formid).target;
var handleresult = function() {
        var s = '';
        var evaled = false;
showloading('none');
        try {
            s = $(ajaxframeid).contentwindow.document.xmldocument.text;
        } catch (e) {
            try {
                s = $(ajaxframeid).contentwindow.document.documentelement.firstchild.wholetext;
            } catch (e) {
                try {
                    s = $(ajaxframeid).contentwindow.document.documentelement.firstchild.nodevalue;
                } catch (e) {
                    s = '内部错误，无法显示此内容';
                }
            }
        }
if (s != '' && s.indexof('ajaxerror') != -1) {
            evalscript(s);
            evaled = true;
        }
        if (showidclass) {
            $(showid).classname = showidclass;
            if (submitbtn) {
                submitbtn.disabled = false;
            }
        }
        if (!evaled && (typeof ajaxerror == 'undefined' || !ajaxerror)) {
            ajaxinnerhtml($(showid), s);
        }
        ajaxerror = null;
        if ($(formid)) $(formid).target = formtarget;
        if (typeof recall == 'function') {
            recall();
        } else {
            eval(recall);
        }
        if (!evaled) evalscript(s);
        ajaxframe.loading = 0;
        $('append_parent').removechild(ajaxframe);
    };
    if (!ajaxframe) {
        try {
            ajaxframe = document.createelement('');
        } catch (e) {
            ajaxframe = document.createelement('iframe');
            ajaxframe.name = ajaxframeid;
            ajaxframe.id = ajaxframeid;
        }
        ajaxframe.style.display = 'none';
        ajaxframe.loading = 1;
        $('append_parent').appendchild(ajaxframe);
    } else if (ajaxframe.loading) {
        return false;
    }
_attachevent(ajaxframe, 'load', handleresult);
showloading();
    $(formid).target = ajaxframeid;
    $(formid).action += '&inajax=1';
    $(formid).submit();
    return false;
}