假装他们认识我

<script type="text/javascript">
if($.isIE678) {
   var html5 = "abbr,article,aside,audio,canvas,datalist,details,dialog,eventsource,figure,footer,header,hgroup,mark,menu,meter,nav,output,progress,section,time,video".split(','),
   i = html5.length;
   while(i--) document.createElement(html5[i]);
}
</script>

dom的createElement方法进行再ie678里创建标签。