javascript常用对象方法

const person = {
    name: 'zhangsan',
    age: 12,
    language: ['java', 'python', 'go']
}
console.log(Object.keys(person))  //返回person的所有key
console.log(Object.values(person))   //返回person 的所有value
console.log(Object.entries(person))   // 以数组形式返回每一个key和value

var a = {name: 'zhangsan'}
var b = {age: 12}
var c = {language: ['java', 'python', 'go']}
Object.assign(a, b, c)
console.log(a)

var name = 'zhanshen'
var age = 14
var per = {name: name, age: age}
console.log(per)
//上边这样key的名字和value的名字一样，就可以如下简写
var p = {name, age}
console.log(p)

const person = {
    name: 'zhangsan',
    age: 12,
    language: ['java', 'python', 'go'],
    eat: function(food) {
        console.log("我是"+this.name+", 我在吃"+food)
    },
    eat2: food => console.log("我是"+this.name+", 我在吃"+food),   // 这种是箭头函数的写法
    eat3: food => console.log("我是"+person.name+", 我在吃"+food),
    eat4 (food) {
        console.log("我是"+this.name+", 我在吃"+food)
    }
}
person.eat('香蕉')
person.eat2('桔子')
person.eat3('草莓')
person.eat4('香橙')      

let per1 = {name: '张三'}
let per1_copy = {...per1}   //  利用 ... 实现深拷贝
console.log(per1_copy)
let age = {age: 12}  
let name = {name: 'zhangsan'}
let person2 = {...name, ...age}   //  合并对象
console.log(person2)