取得顶层窗口

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var isTopOtherSystem = false;//最上层窗口是不是本系统//返回层级窗口function findOpenerWin(win){var openerWin = win.top.dialogArguments;if (!openerWin){openerWin = win.top.opener;}if (openerWin){try{openerWin.top.document.location;}catch(e){isTopOtherSystem = true;  }if (isTopOtherSystem){return openerWin;}return findOpenerWin(openerWin)}else{try{//可能产生跨域异常win.top.document.location;}catch(e){isTopOtherSystem = true;  }}return win;}

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