js 中Object.keys()
2021-01-03 08:28
标签：back like ble array creat sla ret 属性 key Object.keys(obj) 参数 obj:要返回其枚举自身属性的对象 返回值：一个表示给定对象的所有可枚举属性的字符串数组 eg- js 中Object.keys() 标签：back like ble array creat sla ret 属性 key 原文地址：https://www.cnblogs.com/CCTV-1/p/13644784.html// simple array
var arr = [‘a‘, ‘b‘, ‘c‘];
console.log(Object.keys(arr)); // console: [‘0‘, ‘1‘, ‘2‘]
// 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 anObj = { 100: ‘a‘, 2: ‘b‘, 7: ‘c‘ };
console.log(Object.keys(anObj)); // console: [‘2‘, ‘7‘, ‘100‘]
// getFoo is a property which isn‘t enumerable
var myObj = Object.create({}, {
getFoo: {
value: function () { return this.foo; }
}
});
myObj.foo = 1;
console.log(Object.keys(myObj)); // console: [‘foo‘]