AJAX堆栈来自PHP的响应

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                        <a href="/questions/13822322/jquery-how-to-clear-an-element-before-appending-new-content" dir="ltr">Jquery: How to clear an element before appending new content?</a>
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                                (4 answers)
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            <div class="grid--cell mb0 mt8">Closed <span title="2020-03-07 17:36:39Z" class="relativetime">last month</span>.</div>
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I've recently started using and learning JS and jquery. I'm sending a user email from a form to my PHP page to check if any user exists in DB via ajax, then I get a response from my PHP file if the user exists or not and display the text in a div. It's working fine, but because the page doesn't refresh when the button for sending form data is pressed, ajax just stacks the response from PHP.

I probably need to clear the response every time the button is clicked first and then append the response but I can't find the right command for it :/

JS

function sendnewpass() {
        var email = document.getElementById("useremail").value;

        $.ajax({
            type : "POST",
            url  : "login.php", //my php page
            data : { passemail : email },  //passing the email
            success: function(res){  //to do if successful
                $("#emailsentmsg").append(res);  //the the div that i put the response in
            }
        });

}

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