arr.sort(); alert("欢迎 "+arr[0]+","+arr[1]+","+arr[2]+"和"+arr[3]+"同学！"); alert("欢迎 "+arr.slice(0,3).join(",")+"和"+arr[3]+"同学！");
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知行合一的秘密
arr.sort(); alert("欢迎 "+arr[0]+","+arr[1]+","+arr[2]+"和"+arr[3]+"同学！"); alert("欢迎 "+arr.slice(0,3).join(",")+"和"+arr[3]+"同学！");