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第二题

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杨柳岸-晓风残月

#1 Created at ... [Delete] [Delete and Lock User] 
在arr.sort();
var len = arr.length-1;
var one = arr.slice(0, len);
var two= one .join(',  ');
alert("欢迎"+two+"和"+arr[len]+"同学！");此插入代码

杨柳岸-晓风残月

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

arr.sort(); var len = arr.length-1; var one = arr.slice(0, len); var two= one .join(', '); alert("欢迎"+two+"和"+arr[len]+"同学！");

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