1 简单数据类型

var arr = [1,2,3,4,5]; //原数组 
var newArr1 = arr; //浅拷贝
var newArr2 = arr.slice(); //深拷贝
var newArr3 = arr.concat(); //深拷贝
var newArr4 = [...arr]; //深拷贝
var newArr5 = JSON.parse(JSON.stringify(arr)); //深拷贝
arr[0] = 'leon';
arr[1]= '27';
console.log(arr);
console.log(newArr1);
console.log(newArr2);
console.log(newArr3);
console.log(newArr4);
console.log(newArr5);

2 复杂数据类型

var arr = [{name: 'wens'},{age: '26'}]; //原数组 
var newArr1 = arr; //浅拷贝
var newArr2 = arr.slice(); //浅拷贝
var newArr3 = arr.concat(); //浅拷贝
var newArr4 = [...arr]; //浅拷贝
var newArr5 = JSON.parse(JSON.stringify(arr)); //深拷贝
arr[0].name = 'leon';  
arr[1].age = '27';  
console.log(arr);
console.log(newArr1);
console.log(newArr2);
console.log(newArr3);
console.log(newArr4);
console.log(newArr5);