II have created an stop Watch in which I have completed everything

 if(sec==0){
                min++;
                 minv.innerHTML='0'+min;
    
               }
    
            }

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here min is a variable whose value is 0 and minv is a span tag which I selected with DOM

if have used if condition that if sec==0 then increase min variable by 1 it increases first time but from hen it does not increase