Encountered the problem of a JS prototype, has not been resolved

There are some problems with writing code today. First of all, my HTML file is like this

<= "Tag_add"  onclick= "AddUser ()"></Div  >

NN, it is clear that the AddUser () method was called

varAddUser =function () {    varI=0;Document.onkeydown=function(e) {varEV = document.all?window.event:e; if(ev.keycode==13) {            Submit_dialog (); }            if(ev.keycode==27) {Quit_dialog (); }        }    functionQuit_dialog () {
/* Hide Dialog div*/} $ ("#head_close, #bottom_canser"). Click (function() {quit_dialog ();    }); functionSubmit_dialog () {Alert (Name+phone+Plantno); }    $("#bottom_submit"). Click (function() {submit_dialog (); });}

First call, with the mouse point the submit, no problem; second call, eh? How did alert pop up two times?? Mother of the Egg! Third call, OK, alert pops up three times!

I immediately thought of the onclick call function is not every time you want to create a new function instance? Java EE has a single prototype concept, put in this case, it should be JS interpreter every time a new function object of a single case? This problem occurs when the previous singleton is not closed and then a singleton is called?? (here to solve AH!!) )

So I added a code to prove

varAddUser =function () {    varI=0; Document.onkeydown=function(e) {varEV = document.all?window.event:e; if(ev.keycode==13) {submit_dialog (); }            if(ev.keycode==27) {quit_dialog (); }        }    functionQuit_dialog () {/*hiding the dialog div .*/    }    $("#head_close, #bottom_canser"). Click (function() {quit_dialog ();    }); functionSubmit_dialog () {Alert (name+phone+Plantno); }    $("#bottom_submit"). Click (function() {submit_dialog (); I++;    Console.log (i); });}

And look at my control panel.

Yes, just like I thought! It is true that a new instance has been created. Just as I was sure this was the case, I found out that these problems won't happen with a button trigger! Is it because var addUser = function () {} is a prototype for every visit? Do not understand the solution Ah!

It is easy to think of the search for JS prototype How to use, prototype. I've heard a bit about it before and I forgot it for a long time ...

The problem has not been solved, if there is a master answer greatly appreciated Ah!