参考下面的示例代码：

EventUtil.addHandler(window, "load", function(){ var script = document.createElement("script"); 
EventUtil.addHandler(script, "readystatechange", function(event){ 
event = EventUtil.getEvent(event); 
var target = EventUtil.getTarget(event); 
if (target.readyState == "loaded" || target.readyState == "complete"){ 
EventUtil.removeHandler(target, "readystatechange", arguments. callee); 
alert("Script Loaded"); 
} 
});script.src = "example.js"; document.body.appendChild(script); 
});