我也来一下

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

arr.sort();
var str = '欢迎'
var theLastOne = arr.pop();
str+=arr.toString()+'和'+theLastOne+'同学！';
alert(str);

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

哇这个好！我发现如果用loop它就会自动换行，原来可以直接toString()

arr.sort;
alert('欢迎');
var i;
for( i = 0 ; i <arr.length-1;i++){
    alert(arr[i]+',');
}
alert('和'+arr[arr.length-1]+'同学');