js数组合并的两种方法

js代码web // 第一种 var mergeTo = [4,5,6], mergeFrom = [7,8,9]; mergeTo = mergeTo.concat(mergeFrom); mergeTo; // is: [4, 5, 6, 7, 8, 9] //or var a = [1,2], b = [3,4], c = a.concat(b); //

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