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学以致用

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砖头拍苍蝇

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

var arr_lth = arr.length; var name_list = arr.sort(); var msg = "欢迎" + name_list.slice(0, arr_lth-1).join(",") + "和" + name_list.slice(3) + "同学";

alert(msg);

砖头拍苍蝇

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

更正一下：

var arr_lth = arr.length; var name_list = arr.sort(); var msg = "欢迎" + name_list.slice(0, arr_lth-1).join(",") + "和" + name_list.slice(arr_lth-1) + "同学";

alert(msg);

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