本章练习参考答案~

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

console.log(`欢迎${arrSorted[0]},${arrSorted[1]},${arrSorted[2]},和${arrSorted[3]}同学！`);

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

var arrSorted = arr.sort();

console.log(`欢迎${arrSorted[0]},${arrSorted[1]},${arrSorted[2]},和${arrSorted[3]}同学！`);

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

var arrSorted = arr.sort();

---这步没必要，sort函数会改变arr的值顺序