Why is it not reflected after I run it?

Question

Why is it not reflected after I run it? Press f12 to display index:94 Uncaught TypeError: $ is not a function at menuFire (index:94) at HTMLAnchorElement.onclick (index:53)

index.html92- 96 lines of code:

function menuFire(obj){var src = $(obj).attr('src');$('iframe').attr('src',src);}