let time1 = getLocalTime();
let bundle = cc.assetManager.getBundle(bundleInfo.bundleName);
bundle.load(bundleInfo["path"], cc.JsonAsset, function (err, obj) {
let time2 = getLocalTime();
console.log("第一次创建耗时:" + (time2 - time1) / 1000);
console.log("data:" + JSON.stringify(obj.json));
})
打印发现不管load几次 创建都有耗时导致 预加载资源后并不能一帧加载出来 
