arr.sort();
var one = arr.slice(0,arr.length-1).join(',');
console.log(`欢迎${one}和${arr[arr.length-1]}同学`);
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好奇心害死cat
arr.sort();
var one = arr.slice(0,arr.length-1).join(',');
console.log(`欢迎${one}和${arr[arr.length-1]}同学`);