arr.sort(); var str=""; if(arr.length==1){ str='欢迎'+arr[0]+'同学！'; }else{ str='欢迎'+arr.slice(0,arr.length-1)+'和'+arr[arr.length-1]+'同学！'; } alert(str);
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__Tony猫
arr.sort(); var str=""; if(arr.length==1){ str='欢迎'+arr[0]+'同学！'; }else{ str='欢迎'+arr.slice(0,arr.length-1)+'和'+arr[arr.length-1]+'同学！'; } alert(str);