var a = ['小明', '小红', '大军', '阿黄'].sort();
console.log("欢迎" + [a.slice(0, a.length - 1).join(","), a.slice(length - 1)].join("和") + "同学！");
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用户6522882218
var a = ['小明', '小红', '大军', '阿黄'].sort();
console.log("欢迎" + [a.slice(0, a.length - 1).join(","), a.slice(length - 1)].join("和") + "同学！");