// for正序 for (var num in arr){ console.log(hello,${arr[num]}!) };
hello,${arr[num]}!
// for倒序 for (var num in arr.reverse()){ console.log(hello,${arr[num]}!) };
// while正序 number = 0; while(num < arr.length){ console.log(hello,${arr[number]}); number ++ };
hello,${arr[number]}
// while倒序 arr.erverse() while(number < arr.length){ console.log(hello,${arr[number]}); number ++ };
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// for正序 for (var num in arr){ console.log(
hello,${arr[num]}!) };// for倒序 for (var num in arr.reverse()){ console.log(
hello,${arr[num]}!) };// while正序 number = 0; while(num < arr.length){ console.log(
hello,${arr[number]}); number ++ };// while倒序 arr.erverse() while(number < arr.length){ console.log(
hello,${arr[number]}); number ++ };