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第二题

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恶魔的证明

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

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

Ethan-Fanny

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

alert("欢迎"+arr.splice(0,3).join(',')+"和"+arr+"同学！");

N-J-G-

#3 Created at ... [Delete] [Delete and Lock User] 
alert('欢迎'+arr.sort().slice(0, arr.length-1).join("，")+'和'+(arr.sort()).pop()+'同学！');


/*
var newarr=arr.sort();    //排序
var front=newarr.slice(0,arr.length-1);  //取前面的元素
var dot=front.join("，");   //自定义逗号分隔
var last=newarr.pop();   //得到最后一个元素
alert("欢迎"+dot+"和"+last+"同学！");


*/
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