我这样写的可以吗！！

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#1 Created at ... [Delete] [Delete and Lock User]

第一题 var x = arr[1][1];

第二题 console.log('欢迎'+arr.slice(0, 3)+'和'+arr.slice(3)+'同学！');

#2 Created at ... [Delete] [Delete and Lock User]

第一题 var x = arr[1][1];

第二题 console.log('欢迎'+arr.slice(0, 3)+'和'+arr[3]+'同学!');

#3 Created at ... [Delete] [Delete and Lock User]

排序！！！！

#4 Created at ... [Delete] [Delete and Lock User]

第一题 var x = arr[1][1]; 我菜鸟没明白为什么这样写？？

#5 Created at ... [Delete] [Delete and Lock User]

console.log('欢迎'+arr.splice(0,arr.length-1)+"和"+arr+"同学");

这个方法是最简单的

#6 Created at ... [Delete] [Delete and Lock User]

5楼这样会破坏原有的数组，建议还是先copy一个，再用这种方式

#7 Created at ... [Delete] [Delete and Lock User]

console.log(`欢迎${arr.sort().slice(0,3).join()}和${arr.slice(3)}同学!`);

splice会返回一个新数组，不会破坏原有数组。

#8 Created at ... [Delete] [Delete and Lock User]

console.log(`欢迎${arr.sort().slice(0,3)}和${arr.slice(3)}同学!`);

splice会返回一个新数组，不会破坏原有数组。