How can one define $ in jQuery?

Question

I still don't understand why some my jquery code are not working and yet others are working. I used the same criteria but parts of the code is responding and the errors and warnings indicates that $ is used before it's defined. need help on this.

Answer 1

Most likely the Javascript is loading before your jquery script.

wrap it in onload event like below

window.onload = function(){
//my jquery code
$('#txt').html = 'some text'
} // onload end