var scr="欢迎"; var c=arr.pop(); scr+=arr.join(","); scr+="和"; scr+=c; scr+="同学！"; alert(scr);
//改进版 var scr="欢迎"; var c=arr.pop(); scr+=arr; scr+="和"; scr+=c; scr+="同学！"; alert(scr);
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wf68989
var scr="欢迎"; var c=arr.pop(); scr+=arr.join(","); scr+="和"; scr+=c; scr+="同学！"; alert(scr);