正序for-in循环

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
for(var key in arr){
        alert('Hello,'+arr[key]+'!'); 
}

倒序for-in循环

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
for(var key in arr){
arr.reverse();
 alert('Hello,'+arr[key]+'!');
}

正序do-while循环

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
var n=0;
do{alert('Hello,'+arr[n]+'!');n++}while(n<3);

倒序do-while循环

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
var n=0;
do{arr.reverse();alert('Hello,'+arr[n]+'!');n++}while(n<3);