让Iframe自动适应高度，可以设置最小高度

//让Iframe自动适应高度
function SetWinHeight(obj)
{
  var win=obj;
  if (document.getElementById)
  {
   if (win && !window.opera)
  {
  if (win.contentDocument && win.contentDocument.body.offsetHeight)
   {
   if(win.contentDocument.body.offsetHeight<420){
    win.height = 420;//设置最小高度
   }else{
    win.height = win.contentDocument.body.offsetHeight;
    }
   }
   else if(win.Document && win.Document.body.scrollHeight)
   win.height = win.Document.body.scrollHeight;
   }
  }
}

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