concat() 方法用于连接两个或多个数组。
该方法不会改变现有的数组,而仅仅会返回被连接数组的一个副本。
let a = [1,2,3];
let b = [4,5];
let c = a.concat(b); console.log(c); // [1,2,3,4,5]
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