Selenium supported languages like Java support different waits in Selenium, but JavaScript does not have that native function for inserting waits in the code. Hence, we need to use alternatives for realizing JavaScript wait. For example, you can use the combination of Async/Await, setTimeout(),...
3、条件:用async/ wait编写条件代码要简单得多: function loadData() { return getJSON() .then(function(response) { if (response.needsAnotherRequest) { return makeAnotherRequest(response) .then(function(anotherResponse) { console.log(anotherResponse) return anotherResponse }) } else { console.log(...
使用async 声明函数时可以包含一个 await 符号,await 暂停这个函数的执行并等待传递的 Promise 的解析完成,然后恢复这个函数的执行并返回解析后的值。 async/wait 的目的是简化使用承诺的行为 让看看下面的例子: 复制 functiongetNumber1() {returnPromise.resolve('374'); } // 这个函数与getNumber1相同 asyncfun...
async function loadData() { // `rp` is a request-promise function. //`rp` 是一个请求promise函数 var promise1 = rp('https://api.example.com/endpoint1'); var promise2 = rp('https://api.example.com/endpoint2'); // Currently, both requests are fired, concurrently and // now we'...
async function myfunction() { console.log('Inside of myfunction'); } // Here we wait for the myfunction to finish // and then returns a promise that'll be waited for aswell // It's useless to wait the myfunction to finish before to return // we can simply returns a promise that...
async function getRandomNumber() { console.log('Getting random number.'); return Math.random(); } 再创建一个async函数determinReadyToLaunch:如果传入参数大于0.5将返回True async function deteremineReadyToLaunch(percentage) { console.log('Determining Ready to launch.'); ...
创建一个async-function-Promise-chain的文件夹 在main.js中用创建一个返回随机函数的async函数getRandomNumber: asyncfunctiongetRandomNumber() {console.log('Getting random number.');returnMath.random(); } 再创建一个async函数determinReadyToLaunch:如果传入参数大于0.5将返回True ...
}functiongetUsername(person) {returnperson.username; }asyncfunctionchainedFetchMessages(p, username) {// In this function, p is a promise. We wait for it to finish,// then run fetchMessages().constobj =awaitp;constdata =awaitfetchMessages(username);return{ ...obj, [username]: data}; ...
创建一个async-function-Promise-chain的文件夹 在main.js中用创建一个返回随机函数的async函数getRandomNumber: async function getRandomNumber() { console.log('Getting random number.'); return Math.random(); } 再创建一个async函数determinReadyToLaunch:如果传入参数大于0.5将返回True ...
async function f() { return Promise.resolve(1); } f().then(alert); // 1 1. 2. 3. 4. 很简单吧,小编之所以说async/await是基于Promise是没毛病的,async函数返回一个Promise,很简单吧,不仅如此,还有一个关键字await,await只能在async中运行。