源码来自网路,大概简单修改了下,DEMO在最底下

效果图:

 

#笔记#js 实时监听input中值变化-歪歪喂

 

 

 

HTML:

 

<!DOCTYPE html>  
<html>  
    <head>  
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
        <title>RunJS</title>  
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>  
    </head>  
    <body>  
        <h1 >  
            实时监测input中值的变化  
        </h1>  
        <input type="text" id="username" autoComplete='off'>  
        <div id="result"></div>  
    </body>  
</html> 

js:

 

$(function() {

    $('#username').bind('input propertychange', function() {
        $('#result').html($(this).val().length + ' characters');
    });

})

 

>>查看Demo<<