uni-app Object.keys(obj)用法

Posted 2021-06-25 地表最强菜鸡

Object.keys(obj)

对象.keys

很明显是获得对象的key的一个数组

数组的key

arr = ['a', 'b', 'c'];
console.log(Object.keys(arr)); // console: ['0', '1', '2']

对象的key

// array like object
var obj = { 0: 'a', 1: 'b', 2: 'c' };
console.log(Object.keys(obj)); // console: ['0', '1', '2']

// array like object with random key ordering
var an_obj = { 100: 'a', 2: 'b', 7: 'c' };
console.log(Object.keys(an_obj)); // console: ['2', '7', '100']

// getFoo is property which isn’t enumerable

var my_obj = Object.create(
    {}, 

    { 
        getFoo: { 

            value: function() { 

                return this.foo;
             } } 
    });

my_obj.foo = 1;

console.log(my_obj);

console.log(Object.keys(my_obj)); // console: ['foo']

相当于 my_obj={foo:1}

传入字符串，返回索引

var str = 'ab1234';
console.log(Object.keys(obj));  //[0,1,2,3,4,5]

到此 uni-app Object.keys(obj)用法介绍完成。