关于ES6扩展运算符的一些小知识

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let arr = [1,2,3,4,5]
let arr2 = []
console.log(...arr) //1 2 3 4 5
arr2.push(...arr) // arr2 = [1,2,3,4,5]
arr2.push(1,2,3,4,5) // arr2 = [1,2,3,4,5]
let t = ...arr //    Uncaught SyntaxError: Unexpected token ...