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我想編寫一個程序來計算剩餘字符的長度,同時我在文本框中輸入但代碼不工作。計算密鑰上的剩餘字符
下面是HTML代碼:
<!DOCTYPE html>
<html lang="en">
<head>
<title>
</title>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="css/custom.css" />
</head>
<body>
<textarea rows="10" cols="30" maxlength="100">
</textarea>
<p id="area_description"></p>
<script type="text/javascript" src="js/jquery-3.1.1.min.js" ></script>
<script type="text/javascript" src="js/custom.js" ></script>
</body>
</html>
下面是custom.js
代碼:
$(document).ready(function(){
$('#area_description').html('100 characters remaining.');
$('textarea').on('keyup',function(){
var x = $('textarea').val().length();
var y = 100-x;
$('#area_description').html(y+'characters remaining');
});
});