let {a, b} = {a:"x", b:"y"};
//a = x, b = y;

let [a, b] = [0, 1, 2, 3];
//a=0, b = 1;

let [a, ...b] = [0, 1, 2, 3];
//a=0, b = [1,2,3];

// 设有如下函数
function *genFun() {
      yield 'Lily';
      yield 'Json';
      return 'Niu';
    }


// 则以下第一种调用的写法及结果如下：
    let gen = genFun();
    genFun().next();//{value: 'Lily', done: false}
    genFun().next();//{value: 'Json', done: false}
    genFun().next();//{value: 'Niu', done: true}

// 则以下第二种调用的写法及结果如下：
for (i of gen) {	//使用for of 语句来遍历
      console.log(i);
    }
//return后的元素,不会被遍历到
Lily
Json

1)定义
    var prom = new Promise((resolve, reject) => {
      setTimeout(() => {
        console.log('download success')
        resolve('success');
      }, 1000);
    });

    prom.then((flag) => {
      console.log('success block:' + flag);
    }, (error) => {
      console.log('failure block:' + error);
    })

(2)async关键字和Promise实例相结合,实现多个异步线程的顺序执行;
    async function foo() {
      await new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve();
        }, 5000);
      });

      console.log('await function completed');
    }
    foo();
//打印消息会在5s后resolve回调执行后,才执行;

// "editor.fontSize": 20,
// "files.autoSave": "onFocusChange",
// "editor.formatOnPaste": true,
// "workbench.colorTheme": "Solarized Light",
// "[vue]": {
//     "editor.defaultFormatter": "octref.vetur"
// },
// "[javascript]": {
//     "editor.defaultFormatter": "esbenp.prettier-vscode"
// },
"fileheader.customMade": {
    "Author": "dvlproad",
    "Date": "Do not edit",
    "LastEditors": "填入自己的名字",
    "LastEditTime": "Do not edit",
    "Description": "",
    "FilePath": "Do not edit",
},
"fileheader.cursorMode": {
    "description": "",
    "event": "",
    "param": "",
    "return": ""
},
"fileheader.configObj": {
    "prohibitAutoAdd": [
        "json",
        "md",
    ], // 禁止.json .md文件，自动添加头部注释
},