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 = [{
src: "//repo.bfw.wiki/bfwrepo/image/5d6539385ad28.png",
id: "easeljs"
}, {
src: "//repo.bfw.wiki/bfwrepo/image/5d6539385ad28.png",
id: "logo"
}, {
src: "//repo.bfw.wiki/bfwrepo/sound/5c89fd22dea6948307.mp3",
id: "audiofile"
}
];
for (var i = 1; i <= 25; i++)
manifest.push({ src: "//repo.bfw.wiki/bfwrepo/image/5d6539613d08b.png" })
}
//开始预加载
function startPreload() {
preload = new createjs.LoadQueue(true);
//注意加载音频文件需要调用如下代码行
preload.installPlugin(createjs.Sound);
preload.on("fileload", handleFileLoad);
preload.on("progress", handleFileProgress);
preload.on("complete", loadComplete);
preload.on("error", loadError);
preload.loadManifest(manifest);
}
//处理单个文件加载
function handleFileLoad(event) {
console.log("文件类型: " + event.item.type);
if (event.item.id == "logo") {
console.log("logo图片已成功加载");
}
}
//处理加载错误：大家可以修改成错误的文件地址，可在控制台看到此方法调用
function loadError(evt) {
console.log("加载出错！", evt.text);
}
//已加载完毕进度
function handleFileProgress(event) {
progressText.text = "已加载 " + (preload.progress * 100 | 0) + " %";
stage.update();
}
//全度资源加载完毕
function loadComplete(event) {
console.log("已加载完毕全部资源");
}
setupManifest();
startPreload();
</script>
</body>
</html>
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