前端页面上测试和Node.js上测试没啥太大不同,只是需要指定Mocha使用的UI,并需要手动调用mocha.run(): mocha.ui('bdd'); describe('Welcome to Tmall', function() { before(function() { window.render(); }); it('Hello', function() { document.getElementById('tmall').textContent.should.be.eql(...
setTimeout(function|code, delay[, arguments]); 1. function|code:要执行的函数或字符串形式的代码。 delay:延迟执行的时间,单位为毫秒。 arguments:传递给函数的参数(可选)。 setInterval setInterval则用于按照指定的时间间隔(以毫秒为单位)重复执行函数或代码块。其基本语法与setTimeout相似: setInterval(functi...
function after(count, fn) { let runCount = 0; return function runAfter() { runCount = runCount + 1; if (runCount >= count) { return fn.apply(this, arguments); } }; } function end() { console.log("异步操作结束了!"); } const endAfter3Calls = after(3, end); // 定义在执行...
function runForSeconds(s) { var start = +new Date(); while (start + s * 1000 > (+new Date())) {} } document.body.addEventListener("click", function () { runForSeconds(10); }, false); setTimeout(function () { console.log("Done!"); }, 1000 * 3); 如果在等待触发延迟的3秒...
source.then === "function") return source; return Promise.resolve(source); } function run(...
S=function(e,t){return new S.fn.init(e,t)};function p(e){var t=!!e&&"length"in e&&e.length,n=w(e);return!m(e)&&!x(e)&&("array"===n||0===t||"number"==typeof t&&0<t&&t-1 in e)}S.fn=S.prototype={jquery:f,constructor:S,length:0,toArray:function(){return s....
}//call the functionsome_function(5, 15,function(num) {//this anonymous function will run when the//callback is calledconsole.log("callback called! " +num); }); It might seem silly to go through all that trouble when the value could just be returned normally, but there are situations...
after(count, fn):创建仅在多次调用后才执行的函数方法。例如,当想要确保函数只在完成count次异步操作完成后才运行时,这个函数就非常实用。 function after(count, fn) {let runCount = 0;return function runAfter() {runCount = runCount + 1;if (runCount >= count) {return fn.apply(this, arguments)...
Sample Solution: JavaScript Code: functioninvokeAfterDelay(callback){setTimeout(callback,2000);// 2000 milliseconds = 2 second}functiondisplay_message(){console.log('Hello!');}invokeAfterDelay(display_message);// Invokes the sayHello function after a 1-second delay ...
If possible, you can add your script to the page by code, after the page has loaded: Example window.onload=function() { constelement = document.createElement("script"); element.src="myScript.js"; document.body.appendChild(element); }; Avoid...