练习和疑问

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

alert('欢迎'+ arr.slice(0,3) + '和' + arr[3] + '同学！');

为什么很多其他同学要取一个len还要sort一下？为了复用性？？

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

alert('欢迎'+arr.sort().slice(0,-1).join(',')+'和'+arr.slice(-1)+'同学！');

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

排序是题目要求的。

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

先不说排序问题，你确定你这段执行出来有','吗