js控制系统

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<style type="text/css">
		*{
    
    padding: 0px;margin: 0px;}
		:root
		{
    
    
			--base:#ffc600;
			--spacing:10px;
			--blur:10px;
		}
		span
		{
    
    
			color: var(--base);
		}
		img
		{
    
    
			width: 1125px;
			height: 549px;
			padding: var(--spacing);
			background: var(--base);
			filter: blur(var(--blur));/*模糊值:越大则越模糊,最小为0即可.*/
		}
		body
		{
    
    
			text-align: center;
			background: #193549;
			color: white;
			font-family:'helvetica neue',sans-serif;
			font-weight: 100;
			font-size: 30px;
		}
		.controls
		{
    
    
			margin-bottom: 50px;
		}
		input
		{
    
    
			width: 100px;
		}
		.result
		{
    
    
			display: flex;
			flex-direction: row;
			justify-content: center;
			color: var(--base);
		}
		.showText
		{
    
    
			margin: 0px 25px 50px 25px;
		}
	</style>
</head>
<body>
	<h1>Update CSS Variables with <span>JS</span></h1>
	<form class="controls">
		<label for="spacing">Spacing:</label>
		<input type="range" id="spacing" name="spacing" min="0" max="200" value="10" data-sizing="px">
		<label for="blur">Blur:</label>
		<input type="range" id="blur" name="blur" min="0" max="25" value="10" data-sizing="px">
		<label for="base">Base Color</label>
		<input type="color" name="base" id="base" value="#ffc600">
	</form>
	<div class="result">
		<div class="showText">{
    
    spacing:<label id="lw_spacing">#ffc600</label>}</div>
		<div class="showText">{
    
    blur:<label id="lw_blur">10px</label>}</div>
		<div class="showText">{
    
    base:<label id="lw_base">10px</label>}</div>
	</div>
	<img src="./img1.jpg" alt="">
	<script type="text/javascript">
		const inputs=document.querySelectorAll(".controls input");
		inputs.forEach(input=>input.addEventListener("change",handleUpdate));
		inputs.forEach(input=>input.addEventListener("mousemove",handleUpdate));
		function handleUpdate()
		{
    
    
			//第一先判断一下是color的还是其余两个的
			const suffix=this.dataset.sizing||"";
			//然后这一句的意思是:修改:root里面的某一个css变量的值
			document.documentElement.style.setProperty(`--${
      
      this.name}`,this.value+suffix);
			//然后是动态的看到数据.注意一下_
			document.getElementById(`lw_${
      
      this.name}`).innerText=this.value+suffix;

		}
	</script>
</body>
</html>
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