for (var i in arr){
console.log(`Hello,${arr[i]}!`)
}
for (var i in arr.reverse()){
console.log(`Hello, ${arr[i]}!`)
这样反写也可以
var i=arr.length;
while(i>0){
i--;
console.log(arr[i])}
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Ggg🍔
for (var i in arr){
console.log(`Hello,${arr[i]}!`)
}
for (var i in arr.reverse()){
console.log(`Hello, ${arr[i]}!`)
}