SOURCE

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

}) 
/*https://my.oschina.net/marina1216/blog/776295*/   

<h1 >实时监测input中值的变化</h1>  
<input type="range" id="username" min="0" max="50000" step="10">  
<div id="result"></div>