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Qiulihui

第 30 题：请把俩个数组 [A1, A2, B1, B2, C1, C2, D1, D2] 和 [A, B, C, D]，合并为 [A1, A2, A, B1, B2, B, C1, C2, C, D1, D2, D]。

首先想到这样😂 let a=["A1","A2","B1","B2","C1","C2","D1","D2"], B=["A","B","C","D"]; for(let i=B.length; i > 0; i--) { a.splice(i*2,0,B[i-1]); } console.log(a) 输出: ["A1", "A2", "A", "B1", "B2", "B", "C1", "C2", "C", "D1", "D2", "D"]