arr.join(); var newArr = arr.join().split(','); var x = newArr.slice(4, 5); console.log(x);
第二题的答案:
var new_arr = arr.slice(); new_arr.sort(); var last = new_arr.pop(); console.log('欢迎${new_arr.join(','}和${last}同学!');
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zydchina818
第一题的答案:
第二题的答案: