var arr = ['小明','小红','大军','阿黄']
console.log("欢迎"+arr.splice(0,3).join(',')+"和"+arr+"同学")
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如是大庭叶藏
var arr = ['小明','小红','大军','阿黄']
console.log("欢迎"+arr.splice(0,3).join(',')+"和"+arr+"同学")