子页面加入ajax全局方法：

修改iframe高度：

//子页面重新修改父页面iframe高度function reSizeParentIframe() {    var realHeight = 0;    if (navigator.userAgent.indexOf("Firefox") > 0 || navigator.userAgent.indexOf("Mozilla") > 0 || navigator.userAgent.indexOf("Safari") > 0 || navigator.userAgent.indexOf("Chrome") > 0) { // Mozilla, Safari,Chrome, ...          realHeight = window.document.documentElement.offsetHeight + 35;     } else if (navigator.userAgent.indexOf("MSIE") > 0) { // IE          var bodyScrollHeight = window.document.body.scrollHeight + 21; //取得body的scrollHeight          var elementScrollHeight = window.document.documentElement.scrollHeight + 1; //取得documentElement的scrollHeight          realHeight = Math.max(bodyScrollHeight, elementScrollHeight); //取当中比较大的一个      } else {
   //其他浏览器          realHeight = window.document.body.scrollHeight + window.document.body.clientHeight + 1;    }    if (realHeight < 400) {        realHeight = 400;    }    if ($("#ifm", window.parent.document).is("iframe")) {        $("#ifm", window.parent.document).height(realHeight);    }}

 参考：http://www.cnblogs.com/shenyixin/archive/2013/03/05/2943892.html