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Promise 异步 ​

引擎是 Rhino 1.8：用 Promise + .then，不要写 async / await。箭头函数可用。

基本用法 ​

javascript
let promise = new Promise(function (resolve, reject) {
  System.sleep(1000);
  console.log(234);
  resolve('成功');
});

promise.then(resolve => {
  console.log(resolve); // 成功
}, reject => {
  console.log(reject);
});

Promise + 定时器 ​

页面或需要不堵线程时，用 setTimeout 代替 System.sleep：

javascript
let promise = new Promise(function (resolve, reject) {
  setTimeout(function () {
    console.log(234);
    resolve('成功');
  }, 1000);
});

promise.then(resolve => {
  console.log(resolve); // 成功
}, reject => {
  console.log(reject);
});

相关 ​