js 對象操作

js裏對象的深拷貝 

let arr = ['8','7','6'];
let arrObj = JSON.parse(JSON.stringify(arr));
arrObj[0] = '9';
console.log(arr); // ['8','7','6']
console.log(arrObj); // ['9','7','6']

js對象的判斷爲空{}

let obj = {};

JSON.stringify(obj) == "{}"

console.log(JSON.stringify(obj) == "{}"); // true