var resizeTimer = null;??
?? function doResize()
?? {??
???
??? var screenWidth = document.body.offsetWidth;
??? document.getElementById('frametable').style.left = (screenWidth-990)/2;
????????? resizeTimer=null ;
?? }??
?? window.onresize = function()
?? {??
??? if(resizeTimer==null)
??? {??
????? resizeTimer = setTimeout("doResize()",300);??
??? }??
?? }

?

?

让 onresize 事件只执行一次，默认两次，稍作修改。。。
<script>
var resizeTimer = null;


window.onresize = function(){
?? resizeTimer = resizeTimer ? null : setTimeout(doResize,0);
}


function doResize(){
?? alert('resize');
}
</script>