//正序
for(var i in arr){
console.log('hello,'+arr[i]);
}
var a=0;
while(a<3){
console.log('hello,'+arr[a]);
a++;
//倒序
var arr_1=arr.reverse();
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北
//正序
for(var i in arr){
console.log('hello,'+arr[i]);
}
var a=0;
while(a<3){
console.log('hello,'+arr[a]);
a++;
}
//倒序
var arr_1=arr.reverse();
for(var i in arr){
console.log('hello,'+arr[i]);
}
var a=0;
while(a<3){
console.log('hello,'+arr[a]);
a++;
}