Ajax-jquery Serialize subsequent success functions cannot be performed

Ajax form jqueryphp functions

The thing is, I use JQ serialize submit a form content to PHP, after successful display "Submit Success"
After a few tries, I found that every time I submit a content, the URL will change (that is, the form content), then the page will be refreshed, and then after the successful submission of the function it will not be executed.
If I commit the content two times exactly the same, the URL does not change, the successful submission of the function will be executed, this is how to recycle, not to say that Ajax will not refresh the page?
The following is the JQ function
$ (document). Ready (function () {
$ ("#submitform2"). Click (function () {
$.ajax ({
Type: ' POST ',
URL: ' newalead.php ',
Data: $ (' #form1 '). Serialize (),
Success:function () {
Alert (' Submit success ');}
});
})
})

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