第二遍学习

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

console.log(欢迎${arr.slice(0,3).join(',')}和${arr[3]}同学！);

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

应该这样更靠谱 console.log(欢迎${arr.slice(0,(arr.length-1)).join(',')}和${arr[arr.length-1]}同学！);

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

console.log('欢迎'+arr.slice(0,(arr.length-1)).join(',')+'和'+arr[arr.length-1]+'同学!');