Javascript 数组方法 some和filter

用法

filter过滤后返回一个新的数组，不对直接对原数组进行操作
some检查后返回一个boolean值，判断数组中是否有满足的值

    array.filter(callback[,thisargs])    array.some(callback[,thisargs])

实例代码

filter()

eg1. 'use strict'   var result = Object.getOwnPropertyNames(window).filter(function (value) {//window对象的所有属性名        var firstChar = value.substr(0, 3) //截取前三个字母        return firstChar === 'CSS'//判断是否以CSS开头    })    for (let i of result) {       console.log(i)    }

thisargs参数

eg2.'use strict'var arry = ['1', 15, 'the', true, {'name': 'xiaoming'}]            , obj = {min: 10, max: 20}    var result2 = arry.filter(function (value) {        if (typeof value === 'number') {            return value > this.min && value < this.max//        }        return false    }, obj)    for (let i of result2) {           console.log(i)//15    }

some()

eg3.var arry = [1, 2, 3, 4, 5, 6], result3=arry.some(function(value){    return value%2===0})console.log(result3)//true