ES6方法的特性总结

1.filter---返回新数组(筛选)

        var thenew = [1,2,3,4,5];
        var theold = [4,3,2,1];
        var thefilter = thenew.filter( i => theold.indexOf(i) >= 0 );
        console.log(thefilter)

打印结果：(可以排序)

2.map---返回新数组(处理数组数据，每一项运算)

var thenewlist = [
    {id:0,name:'aaa'},
    {id:1,name:'bbb'},
    {id:2,name:'ccc'},
    {id:3,name:'ddd'},
    {id:4,name:'eee'},
    {id:5,name:'fff'},
];
var theoldlist = thenewlist.map(v => v.id)
console.log(theoldlist);

3.every---返回布尔值(每一项判断)   一假即假

4.some---返回布尔值(符合项判断)   一真即真

5.reduce---返回叠加值

6.find---返回第一个符合项，否则undefinded

7.fill---填充原数组(返回新数组)