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                                            四叶草

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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]。

let arr1 = ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2'] let arr2 = ['A', 'B', 'C', 'D']; let arr = arr1.concat(arr2).sort((a,b)=>{ if(a.charCodeAt(0)!==b.charCodeAt(0)){ return a.charCodeAt(0)-b.charCodeAt(0); }else{ if(a.charCodeAt(1)===''){ return -1; }else...