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var myArray = ['a', 'b', 'c'];

=============================
ES5提取数值方式

var
  one   = myArray[0],
  two   = myArray[1],
  three = myArray[2];

// one = 'a', two = 'b', three = 'c'

=============================
ES6提取数值方式

const [one, two, three] = myArray;

// one = 'a', two = 'b', three = 'c'

//可以跳过某值
const [one, , three] = myArray;

// one = 'a', three = 'c'

//使用rest操作符获取剩余元素
const [one, ...two] = myArray;

// one = 'a', two = ['b, 'c']

var _ = require("lodash");
var objects = [{
    "user": "a",
    "age": 20,
    "name": "aname"
}, {
    "user": "b",
    "age": 30,
    "name": "bname"
}, {
    "user": "c",
    "age": 40,
    "name": "cname"
}];

var results = [];
console.log(objects.filter(function (object) {
    var a = _.pick(object, ['user', 'name']);

    console.log(a);
    results.push(a);
}));
console.log(results);
// =>
// [ { user: 'a', name: 'aname' },
//   { user: 'b', name: 'bname' },
//   { user: 'c', name: 'cname' } ]

var _ = require("underscore");

var json = '[{"user": "a", "age": 20}, {"user": "b", "age": 30}, {"user": "c", "age": 40}]';
var users = JSON.parse(json);
var filtered = _.where(users, {
    user: "a"
});

console.log(filtered);
// => [ { user: 'a', age: 20 } ]

var adate = new Date();
var newdate = adate.toLocaleString();
console.log(newdate);
---------------------
输出结果：2018-10-16 15:42:53

//nodejs时间格式化
Date.prototype.Format = function (fmt) {
    var o = {
        "M+": this.getMonth() + 1, //month
        "d+": this.getDate(), //day
        "h+": this.getHours(), //hour
        "m+": this.getMinutes(), //minute
        "s+": this.getSeconds(), //second
        "q+": Math.floor((this.getMonth() + 3) / 3), //season
        "S": this.getMilliseconds() //msec
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}

var time1 = new Date().Format("yyyy-MM-dd");

var time2 = new Date().Format("yyyy-MM-dd hh: mm: ss: S");

console.log("time1:       " + time1);
console.log("time2:       " + time2);

------------------------------------
输出结果：
time1:       2018-10-16
time2:       2018-10-16 15: 42: 53: 276

function asnycJob() {
  // ...其他代码
  var f = yield readFile(fileA);
  // ...其他代码
}