1、左右两个边结构必须一样
let [a, b, c] = [1, 2, 3]
console.log(a, b, c);
let {a,c,d}={a:12,c:5,d:6};
console.log(a,c,d);
let [{a,b},[n1,n2,n3],num,atr]=[{a:12,b:5},[12,5,8],8,'cxzcv'];
console.log(a,b,n1,n2,n3,num,atr);
let [json,arr,num,atr]=[{a:12,b:5},[12,5,8],8,'cxzcv'];
console.log(json,arr,num,atr);
2、右边必须是个东西(合法的东西)
let [a,b]={a:12,b:45}; //错误,左右两边结构必须一样
console.log(a,b)
let {a,b}={12,5}; //错误,右边必须是个东西(合法的东西)
console.log(a,b)
3、声明和赋值不能分开,必须在一句话里完成
let [a,b]; //错误,声明和赋值不能分开
[a,b]=[12,5];
console.log(a,b)