数组解构赋值[a,b]=[1,2];、方法返回function f(){return [1,2]}let a,b;[a,b]=f();//a=1,b=2 function f1(){return [1,2,3,4,5]}let a,b;[a,b]=f();//a=1,b=2 [a,,...b]=f1();//a=1;b=[3,4,5] 对象解构赋值 {a,b=1}={a:1,b:2}