console.log(`欢迎${arr.sort().slice(0,3)}和${arr.pop()}`);
console.log(`欢迎${arr.sort().slice(0,arr.length-1).join(',')}和${arr.pop()}`);
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夜风菩提雨
console.log(`欢迎${arr.sort().slice(0,3)}和${arr.pop()}`);