var str=""
var d=[];
var c="";
arr.filter((a,b)=>{
if(b==arr.length-1){
c=a
}else{
d.push(a);
}
str=`欢迎${d.join(',')}和${c}同学！`
return str
})
console.log(str);
犯傻了我，哈哈哈
var last=arr.pop()
console.log(`欢迎${arr.join(',')}和${last}同学！`)
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不响丸辣
var str=""
var d=[];
var c="";
arr.filter((a,b)=>{
if(b==arr.length-1){
c=a
}else{
d.push(a);
}
str=`欢迎${d.join(',')}和${c}同学！`
return str
})
console.log(str);