2.
<iframe name="if1" id="if1" src="http://10.25.5.23/common/ss.jsp" style="display:''">window.frames["if1"].document.title
<iframe name="if1" id="if1" src="http://10.25.5.23/common/ss.jsp" style="display:''">window.frames["if1"].document.title
<button onclick="t()">title</button>
<script>
function t(){
alert(window.frames["if1"].document.title);}
</script>
是否可以用settimeout函数延时