ES6 扩展运算符... 与rest

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// ...
arr1 = [1,2,3]
arr2 = [4,5,6]
arr3 = [7,8,9]
 
arr4 = [...arr1, ...arr2, ...arr3] //[1,2,3,4,5,6,7,8,9]  用于数组合并
console.log(arr4);

// rest   （相当于...的逆运算）
let [a,...rest] = [1,2,3,4];
console.log(a);//1
console.log(rest);//[2,3,4]