for 正序: for (var i in arr){ console.log('Hello,' + arr[i] + '!'); };
for 逆序: for (var i in arr.reverse()){ console.log('Hello,' + arr[i] + '!'); };
while正序: var i = 0; while(i <=2){ console.log('Hello,' + arr[i] + '!'); i++; };
while逆序 var i = 2; while(i >=0){ console.log('Hello,' + arr[i] + '!'); i = i-1; };
Sign in to make a reply
丁香园GDMC站
for 正序: for (var i in arr){ console.log('Hello,' + arr[i] + '!'); };
for 逆序: for (var i in arr.reverse()){ console.log('Hello,' + arr[i] + '!'); };
while正序: var i = 0; while(i <=2){ console.log('Hello,' + arr[i] + '!'); i++; };
while逆序 var i = 2; while(i >=0){ console.log('Hello,' + arr[i] + '!'); i = i-1; };