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JS實現文字倒計數

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>My Practice</title>
    <script src="jquery-3.2.1.js"></script>
</head>
<body>
    <div>
        <textarea onkeyup="javascript:checkWord(this);" onmousedown="" ></
textarea>(<span id="ResidueCount">10</span>) </div> <span>test</span> <script type="text/javascript"> var str = ""; var maxLength = 10; function checkWord(c) { str = c.value; //console.log(str + " " + str.length);
var len = maxLength - str.length; if (len >= 0) { $("#ResidueCount").text(len); } else { c.value = str.substring(0, maxLength); } } </script> </body> </html>

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JS實現文字倒計數