preloadjs如何预加载资源？
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看看这个代码，预加载图片声音等资源，并显示进度：
<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<canvas id="myCanvas" width="350" height="420"></canvas>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/createjs-1.3.2.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/preloadjs-0.2.0.min.js"></script>
<script>
var canvas = document.getElementById("myCanvas");
var stage = new createjs.Stage(canvas);
var manifest;
var preload;
var progressText = new createjs.Text("", "20px Arial", "#dd4814");
progressText.x = 20 - progressText.getMeasuredWidth() / 2;
progressText.y = 20;
stage.addChild(progressText);
stage.update();
//定义相关JSON格式文件列表
function setupManifest() {
manifest = [{
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by thinkfuture
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