如何在数组内 console.log() 重复？

Question

why does this for loop print a , o one time only, when lst_ has two a and two o ? how to fix , solve this to show all the items

if you use console.log(x); then you can see each one in the console, when this line is commented the console has only a,i,o each one a single time

 var lst_ = [ "a", "a", "i", "o", "o" ]; var x ; for (x =0; x < lst_.length ; x++) { console.log(lst_[x]); // console.log(x); }

Answer 1

Look at the console closely. You'll see there is a number in a blob to the left of the message.

This means that there were that number of identical, sequential messages logged to the console.

They just aren't shown one-by-one to avoid flooding the console (which becomes an issue when, for instance, you have something being logged every second) and obscuring other messages.

You can turn "group similar" off in the console settings.

Answer 2

If same values occurs again, the console will indicate it with a number as follows. In your case the 'a' prints 2 times in sequence, so it shows 2 in right side.

Answer 3

in the right of your console, you see a number. This number represents the times the same line would have been printed. If you would change the order of your array, eg like this: [ "a", "i", "o", "a", "o" ] , you should see every line