Placeholder在IE8的兼容问题

<script type="text/javascript">
 if( !('placeholder' in document.createElement('input')) ){  

   $('input[placeholder],textarea[placeholder]').each(function(){
     var that=$(this),
     text= that.attr('placeholder');
     if(that.val()===""){
       that.val(text).addClass('placeholder');
     }
     that.focus(function(){
       if(that.val()===text){
         that.val("").removeClass('placeholder');
       }
     })
     .blur(function(){
       if(that.val()===""){
         that.val(text).addClass('placeholder');
       }
     })
     .closest('form').submit(function(){
       if(that.val() === text){
         that.val('');
       }
     });
   });
 }
</script>

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