html5的在ie6，7，8兼容

    <script>
        //html5 标签
        (function () {
            if (!/*@cc_on!@*/0) return;
            var html5 = "abbr,article,aside,audio,bb,canvas,datagrid,datalist,details,dialog,eventsource,figure,footer,hgroup,header,mark,menu,meter,nav,output,progress,section,time,video".split(',');
            for (var i in html5) {
                document.createElement(html5[i]);
            }
        })();
    </script>
    <![endif]-->