js如何判断 iframe 是否完全加载

var iframe = document.createElement("iframe"); iframe.src = "http://www.manongjc.com"; if (!/*@cc_on!@*/0) { //if not IE iframe.onload = function(){ alert("Local iframe is now loaded."); }; } else { iframe.onreadystatechange = function(){ if (iframe.readyState == "complete"){ alert("Local iframe is now loaded."); } }; } document.body.appendChild(iframe); 

var iframe = document.createElement("iframe"); iframe.src = "http://manongjc.com"; 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);