<html><script type="text/javascript" src="jquery.js"></script><style>.d_b{ height: 20px; width: 10px; display: inline-block; background-color: black; position: relative; vertical-align: middle; top: -15px; left: -5px;}</style><div id="d" style="width:200px;cursor: pointer;" max=100 min=0 value=10 ><div style="height:10px; width:100%; background-color:green" ></div><b class="d_b"></b></div><b id="text"></b><script>var $dom = $(document);$dom.on('mousedown','#d',function (argument) { $(this).data('mouse','down'); console.log('down');})$dom.on('mouseup',function(){ $('#d').data('mouse','up'); console.log('up');});$dom.on('mousemove','#d',function(event){ if($(this).data('mouse') == 'down'){ var m_x = event.clientX; var d_b = $(this).find('.d_b'); m_x = m_x < 8 ? 8 : m_x; m_x = m_x > 208 ? 208: m_x; d_b.css('left',m_x-13); var max = $(this).attr('max'); $(this).attr('value', Math.floor((m_x-8)/200 * max)) console.log($(this).attr('value')); $('#text').text($(this).attr('value')) }});</script></html>效果图：
![[Web front-end] Permulaan pantas Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
