题目：
请把两个数组 [‘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’]。
let arr1 = ["A1", "A2", "B1", "B2", "C1", "C2", "D1", "D2"]; let arr2 = ["A", "B", "C", "D"]; console.log( [...arr1, ...arr2] .sort( (v2, v1) => ( v2.codePointAt(0) - v1.codePointAt(0) || v1.length - v2.length || v2.codePointAt(1) - v1.codePointAt(1) ) ) );扩展性强，没有硬编码
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