JavaScript 模拟后台任务
读书笔记,请勿转载,发布,产权不归我所有,归以前作者所有,我只是做读书笔记。
/*!
* Copyright 2015 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
/*
* @see https://developers.google.com/web/updates/2015/08/using-requestidlecallback
*/
window.requestIdleCallback = window.requestIdleCallback ||
function (cb) {
var start = Date.now();
return setTimeout(function () {
cb({
didTimeout: false,
timeRemaining: function () {
return Math.max(0, 50 - (Date.now() - start));
}
});
}, 1);
}
window.cancelIdleCallback = window.cancelIdleCallback ||
function (id) {
clearTimeout(id);
}