Automatic character insertion in a form to validate CPF

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Friends, I am making a CRUD system and now I am working on consistencies, and in the part q the user type the CPF, I want that after typing 3 numbers, a point is inserted automatically, can anyone help? , thanks in advance

php javascript crud

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Download this lib (http://www.geradorcpf.com/jquery.maskedinput-1.1.4.pack.js) and use as follows:

<script type="text/javascript" src="js/jquery.maskedinput-1.1.4.pack.js"/></script>

<input type="text" name="cpf" id="cpf" />

<script type="text/javascript">
    jQuery(document).ready(function($){ 
        $("#cpf").mask("999.999.999-99");
    });
</script>

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