<script>
var win = window.open("in.htm")
</script>
<input type="button" onclick="if(!win.closed)alert('存在')" value="check">
var win = window.open("in.htm")
</script>
<input type="button" onclick="if(!win.closed)alert('存在')" value="check">
window.open("in.htm","win_name")
</script>
<input type="button" onclick="if(!win_name.closed)alert('存在')" value="check">
这样能行否?
如果这个窗口不是在本页的window.open打开的怎么判断?