随便写写吧

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

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

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

arr.sort(); var a = arr.pop(); arr.join(","); alert('欢迎'+arr+'和'+a+'同学！');

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

arr.slice; alert ('欢迎'+ arr +'同学！');