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交作业

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慧眼的安娘娘

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

第一题：

var x = arr[1][1];

第二题：

arr.sort();
var last = arr.pop();
console.log(`欢迎${arr.join('，')}和${last}同学！`);

慧眼的安娘娘

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

优化一下第二题答案，原答案会破坏arr原结构，影响后续调用。

var copyArr = arr.slice();
copyArr.sort();
var last = copyArr.pop();
console.log(`欢迎${copyArr.join('，')}和${last}同学！`);

桃花坞的七殿下

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

感觉是最好的方法

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