父页面iframe自动适应子页面的宽高度

<script type="text/javascript">
   function load(){
     parent.document.getElementById("myiframe").style.height = document.body.scrollHeight +"px";
     parent.document.getElementById("myiframe").style.width = document.body.scrollWidth +"px";
   }
</script>

<body onLoad="load();">
或

<iframe name="main" src="#" frameborder="0" scrolling="no" style="min-width:750px;" scrolling="auto" , 200);
</script>

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