地址值

1. const obj1 ={

name:'a'

}

const obj2 = {

name: 'a'

}

const arr = [1,2,3];

const arr2 = [1,2,3]

console.log(obj1 == obj2, arr == arr2)//false,false

 

2.var obj1 ={

name:'a'

}

var obj2 = obj1;

obj2.name = 'b';

console.log(obj1.name) //b

3.

 

var arr = [1,2,3];

var arr2 = arr;

arr2[0] = 4;

arr[2] =5

console.log(arr, arr2) //[ 4, 2, 5 ] [ 4, 2, 5 ]