转：

var iframe = document.createElement("iframe");iframe.src = "http://www.planabc.net"; if (iframe.attachEvent){    iframe.attachEvent("onload", function(){        alert("Local iframe is now loaded.");    });} else {    iframe.onload = function(){        alert("Local iframe is now loaded.");    };} document.body.appendChild(iframe);

或者：

var iframe = document.getElementById("frm_txt_ParentId");                        iframe.src = "dialog/common-mselect.aspx?dialogName=select_customer&selectionMode=1&filter=";                        if (iframe.attachEvent) {                        //IE                            iframe.attachEvent("onload", function () {                                alert("111111Local iframe is now loaded.");                            });                        } else {                        //非IE                            iframe.onload = function () {                                alert("222Local iframe is now loaded.");                            };                        }