es6 - filter for-chrome

 'use strict';
 let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
 
 // 除去取余2的 - es6
 let es5OddNumbers = numbers.filter(function (number) {
     return number % 2;
 });
 console.log(es5OddNumbers);
 
 //  除去取余2的 - es6 - 第二种写法
 let es6OddNumbers = numbers.filter(number => number % 2);
 console.log(es6OddNumbers);
 
 // 和es5不一样的函数返参
 let square = x => x * x;
 console.log(square(10));
 
 // let add = (形参1,形参2,...)
 let add = (a, b) => a + b;
 console.log(add(3, 4));
 
 // 数组对象
 let developers = [{ name: 'Rob' }, { name: 'Jake' }];
 // 回调拿出name
 let es5Output = developers.map(function (developer) {
     return developer.name;
 });
 console.log(es5Output);
 
 let es6Output = developers.map(developer => developer.name);
 console.log(es6Output);
 
 // es5 倒计时
 function CounterES5() {
     this.seconds = 0;
     window.setInterval(function () {
         this.seconds++;
     }.bind(this), 1000); // or }.bind(this), 1000) and skip that = this
 }
 var counterA = new CounterES5();
 window.setTimeout(function () {
     console.log(counterA.seconds);
 }, 1200);
 
 // es6倒计时
 function CounterES6() {
     this.seconds = 0;
     window.setInterval(() => this.seconds++, 1000);
 }
 
 let counterB = new CounterES6();
 window.setTimeout(() => console.log(counterB.seconds), 1200);