效果：
实现代码(需要引入jquery)：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="jquery-1.8.3.js" type="text/javascript"></script>
<style type="text/css">
* {
padding: 0;
margin: 0;
}
.slider-panel {
background-color: #fcc688;
height: 450px;
600px;
padding: 20px;
margin: auto;
}
.slider-panel .slider-box {
background-color: darkgray;
margin-top: 40px;
display: inline-block;
305px;
height: 6px;
position: relative;
border-radius: 5px;
}
/* 滑条划过的宽度，默认值为0 */
.slider-panel .slider-box .slider-value {
background-image: linear-gradient(90deg, #82E0F7 0%, #009DDC 52%);
height: 6px;
0;
border-radius: 5px;
}
/* 滑条的样式。默认透明 */
.slider-panel input {
position: absolute;
left: 0;
top: 0;
-webkit-appearance: none;
-ms-appearance: none;
background: transparent;
305px;
height: 2px;
outline: none;
}
/* 圆形滑块的样式 */
.slider-panel input[type=range]::-webkit-slider-thumb {
-webkit-appearance: none;
height: 12px;
12px;
background-color: #eaecee;
border-radius: 50%;
cursor: pointer;
box-shadow: 0 2px 4px 0 #212B35;
background: #4BBEEC;
border: 2px solid #FFFFFF;
}
</style>
<script type="text/javascript">
$(function() {
//绑定鼠标滑动事件
$(' .slider-panel input').on('mousemove touchmove touchend click', moveSlider)
function moveSlider() {
// 获取当前滑条的动态值
let sliderValue = parseInt($(this).val());
// 将滑条的值赋值给滑条划过后p标签的宽度
$('.slider-value').css('width', sliderValue + '%');
// 显示当前滑条的动态值
$('.slider-percentage').text(sliderValue);
}
})
</script>
<title>彩色渐变滑动条</title>
</head>
<body>
<div class="slider-panel">
<!--slider-box表示整个滑条的颜色 -->
<div class="slider-box">
<!--slider-value表示滑条划过后的部分用一个颜色显示覆盖slider-box的颜色达到进度作用 -->
<p class="slider-value"></p>
<!-- 滑条的背景颜色透明只有-->
<input type="range" min="0" step="1" max="100" value="0">
</div>
<p><span class='slider-percentage'>0</span>%</p>
</div>
</div>
</body>
</html>