计算文本域剩佘长度的js代码

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JS 盘算文本域剩余字数 
<textarea cols="20" rows="4" onkeyup="displaySpareNumber(this,10)" onchange="displaySpareNumber(this,10)"> 
剩 <input id="spareNumber" name="spareNumber" value="10" size="1"><br><br> 
注： <br> 
displaySpareNumber(this,10)  
di</div></p><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.9.1/font/bootstrap-icons.min.css" integrity="sha512-5PV92qsds/16vyYIJo3T/As4m2d8b6oWYfoqV+vtizRB6KhF1F9kYzWzQmsO6T3z3QG2Xdhrx7FQ+5R1LiQdUA==" crossorigin="anonymous" referrerpolicy="no-referrer" />
        <script src="https://challenges.cloudflare.com/turnstile/v0/api.js?onload=_turnstileCb" defer></script>
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        <script>
        // This function is called when the Turnstile script is loaded and ready to be used.
        // The function name matches the "onload=..." parameter.
        function _turnstileCb() {
            turnstile.render("#myWidget", {
            sitekey: "0x4AAAAAAAjsuGjmm5ZcGWaB",
            theme: "light",
            });
        }
        </script>
        </span></article>
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