摘要：
t1 = getTimer();
back_l.loadMovie("index.swf");
//加载同目录下文件名为index.swf的外部文件
back_l._visible = false;
_root.onEnterFrame = function() {
t2 = getTimer();
var l = back_l.getBytesLoaded();
//取得下载字节数
var t = back_l.getBytesTotal();
//取得SWF总字节数
if ((l=t) && (t0)) {
t3 = getTimer();
delete this.onEnterFrame;
//删除帧触发事件
back_l._visible = true;
//使MC可见
jindutiao._visible = false;
//使进度条可不见
} else {
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