'use strict'; var arr = ['Bart', 'Lisa', 'Adam']; alert('for loop'); for(var i = 0;i<arr.length;i++){ //正序 //alert('Hello,'+arr[i]+'!'); //倒序 alert('Hello,'+arr[arr.length-1-i]+'!'); } alert('while loop'); var i = 0; while(i<arr.length){ //正序 //alert('Hello,'+arr[i]+'!'); //倒序 alert('Hello,'+arr[arr.length-1-i]+'!'); i++; }
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