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);
});
