javascript - why isnt this setInveral function working? -

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i cant figure out i'm doing wrong

 function countnum(){      let num=0;      function inner(){             num++             console.log(num);                }           }   setinterval(countnum,1000)

you defining function not calling 

function countnum(){      let num=0;      function inner(){             num++             console.log(num);                }               inner();/////////////////////////////           }   setinterval(countnum,1000)

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