while (i<arr.length){ console.log(Hello,${arr[i]}!); i++; } arr= arr.reverse() for (var i in arr){ console.log(Hello,${arr[i]}!) }
Hello,${arr[i]}!
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黄展奇
while (i<arr.length){ console.log(
Hello,${arr[i]}!); i++; } arr= arr.reverse() for (var i in arr){ console.log(Hello,${arr[i]}!) }