var arr1= ['小明', '小红', '大军', '阿黄'];
console.log(`欢迎${arr1.slice(0,3).join(",")}和${arr1.pop()}同学`)
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你仍是少年w
var arr1= ['小明', '小红', '大军', '阿黄'];
console.log(`欢迎${arr1.slice(0,3).join(",")}和${arr1.pop()}同学`)