ES6中的数组filter方法

假定有一个对象数组， 获取数组中指定类型的对象数组放到新数组中

var arr = [
            {name:'jerry',sex:'man'},
            {name:'jack',sex:'woman'}
        ]
        var manArr = arr.filter(function(obj){
            return obj.sex === "man"; //获取性别为man的对象
        })
        console.log(manArr);  //[{name: "jerry", sex: "man"}]

假定有一个对象数组， 过滤掉不满足条件的对象

var arr = [
            {name:'jerry',sex:'man',age:22},
            {name:'jack',sex:'woman',age:19},
            {name:'liming',sex:'man',age:17}
        ]
var childBoyArr = arr.filter(function (obj) {
    return obj.sex === 'man' && obj.age < 18;  //获取小于18岁的男孩
})
console.log(childBoyArr);  //[{name: "liming", sex: "man", age: 17}]

假定有两个数组，根据第一个数组的值过滤另一个数组不符合的数据

var arr1 = [{id:2}]
var arr2 = [
    {pId:3,name:'张三'},
    {pId:2,name:'李四'},
    {pId:4,name:'王五'},
    {pId:2,name:'赵六'}
]
var newArr = arr2.filter(function(obj){
    return obj.pId == arr1[0].id;  
})
console.log(newArr); //[{pId:2,name:'李四'},{pId:2,name:'赵六'}]