Q1: var x = arr[1].slice(1,2);
Q2: arr.sort(); alert('欢迎'+arr.slice(0,3)+'and'+arr.slice(3)+'同学!');
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戴鑫soulfire
Q1: var x = arr[1].slice(1,2);
Q2: arr.sort(); alert('欢迎'+arr.slice(0,3)+'and'+arr.slice(3)+'同学!');