How to trigger an input event with jQuery? -

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I want to add 'a' to the value of input when I click on a button

This is my Code is (with jQuery 1.4.4): 

  $ ("# button"). Click (function () {$ ("# input"). Trigger ("focus"); var e = JQuery.Event ("keypress"); e.which = '97'; $ ("# input"). Trigger (e);})   
 However, this was the only trigger 'focus' event, but 'keypress' failed.   
 
 
 this way ?? Sorry, I'm confused with your articles ..  
 Click  $ ("# button") (function () {$ ("# input"). Trigger ("keypress") / / If you need .., then you can trigger such a keypad .val (function (i, val) {return val + 'a';});});   
 Reference:

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