不跨域的情况下父页面访问iframe内元素和js方法的完整步骤
1.首先两个页面在同一域下
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例：A.HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>resize</title><meta name="author" content="Administrator" /><!-- Date: 2013-08-30 --></head><body><div> <iframe name="test" src="B.HTML" id="test" frameborder="no" style="margin: 50px 80px 0 90px;width:90%;height: 500px;"></iframe> </div></body></html>
?B.HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>resize</title><meta name="author" content="Administrator" /><!-- Date: 2013-08-30 --><script>function resize() {var parentwh = parent.innerHeight;var parentww = parent.innerWidth;var parentscreenh = parent.screen.height;var parentscreenw = parent.screen.width;var gridDiv = document.getElementById("gridWropper");var got = gridDiv.offsetTopvar winh = window.innerHeight;var winw = window.innerWidthvar w = winh - got;var screenX = screenLeft;var screenY = screenTopvar allFrames = parent.frames;var currentWin = null;for (var i = 0; i < allFrames.length; i++) {if (allFrames[i] == window) {currentWin = allFrames[i];}}}</script></head><body onresize="resize()"><div id="gridWropper" style="height:90%;width:100%;overflow:auto;border: 2px dashed black;word-break: break-all;"></div></body></html>?接下来如果要在A中访问B中的方法，首先得先判断B是否加载完成，加载完成后才能访问（这个太重要了）
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?js
var iframe = document.getElementById("test"); if (!/*@cc_on!@*/0) { //if not IE iframe.onload = function(){ alert("Local iframe is now loaded.chrome");alert(iframe.contentWindow.resize) }; } else { iframe.onreadystatechange = function(){ if (iframe.readyState == "complete") { alert("Local iframe is now loaded.ie"); //alert(iframe.document.getElementById("test"));alert(iframe.contentWindow.resize) } }; }?