arr.sort();
var str = arr.slice(0,arr.length-1);
var last=arr.slice(arr.length-1);
console.log(`欢迎${str}和${last}同学！`);
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勤劳生存
arr.sort();
var str = arr.slice(0,arr.length-1);
var last=arr.slice(arr.length-1);
console.log(`欢迎${str}和${last}同学！`);