1,可以更加优雅对数组进行拼接,
原来的写法
const a = [1,2,3];
const b = [4,5,6];
const c = a.concat(b);
现在的写法
const c = […a,…b];
ES6,3、扩展运算符
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Origin blog.csdn.net/jinfeng_yu/article/details/121328044
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