I thought every line of the code need semicolon?

I thought every line of the code need semicolon?


But then when I download some video files of
JQuery and then I found this lines. Why they dont use semicolon?


function showRequest(formData, jqForm) { 

 var extra = [ { name: 'ajax', value: '1' }];
 $.merge( formData, extra)

    return true;  
}