我要先加载页面，然后再加载iframe。问题是在某些页面上有两个不同的iframe来源（外部）。我了解body unload是实现这一目标的方法。
对于多个iframe，我需要对代码的哪一部分进行更改？
我的代码如下：
//doesn't block the load event
function createIframe() {
var i = document.createElement("iframe");
i.src = "https://thetaphunter.appspot.com/widgets/locationWidget?orderby=style&style=on&breweryname=on&format=images&brewerylocation=on&servingtype=both&updatedate=on&location=The-Hangout-Restaurant-and-Beach-Bar";
i.scrolling = "auto";
i.frameborder = "0";
i.width = "90%";
i.height = "220px";
document.getElementById("map").appendChild(i);
};
// Check for browser support of event handling capability
if (window.addEventListener) window.addEventListener("load", createIframe, false);
else if (window.attachEvent) window.attachEvent("onload", createIframe);
else window.onload = createIframe;