es6 连接数组
const a=1;
const b=[2,3];
c=[a,...b];
[e,...f]=[1,2,3,4];
console.log(c);
console.log(e);
console.log(f);
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const a=1;
const b=[2,3];
c=[a,...b];
[e,...f]=[1,2,3,4];
console.log(c);
console.log(e);
console.log(f);