textarea字数统计

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="./js/jquery-1.11.3.min.js"></script>
    <title>Document</title>
    <style>
        #current{
            color: red;
        }

    </style>
</head>
<body>
    <textarea cols="80" rows="5" id="textarea" name="" maxlength="12"></textarea>
    <span id="current">0</span>/<span id="all">12</span>
    <script type="module">
        $('textarea').bind('input propertychange',function(e){
        $('#current').text(e.target.value.length)     
        })
    </script>
</body>
</html>
效果：