解决window.onresize事件多次调用问题

解决window.onresize事件多次调用问题：

<script type="text/javascript">
var  resizeTimer = null;

function doResize(){
  alert("width="+(document.documentElement||document.body).clientWidth +
       "   Height="+(document.documentElement||document.body).clientHeight);
}

window.onresize = function(){
  if(resizeTimer) clearTimeout(resizeTimer);
  resizeTimer = setTimeout("doResize()",300);
}
</script>