这是正确的代码

<script type="text/javascript">
$(document).ready(function(){
  $("#register_reg").click(function(){
    $("#register_form").load("test_test.php #register_rules", function() { 
        $("#register_form").append("<script type='text/javascript' src='jquerycode.js'></" + "script>"); 
    });
  });
});
</script>