Without further ado, I will just post the js code for you. The specific code is as follows:
<!doctype html>
<html>
<head>
<meta charset="utf-">
<title>无标题文档</title>
<style>
.fontSize
{
font-size:px;
}
.fontWeight
{
font-weight:bold;
}
</style>
</head>
<body>
<div id="div" class="fontSize fontWeight" style="color:red">div实例文本</div>
<button onclick="changeStyle()">changeStyle()</button>
<script>
function changeStyle()
{
var div = document.getElementById("div");
//div.className = "fontSize";
//div.className += " fontWeight";
//删除单个class=""样式
//div.className = div.className.replace(/fontSize/,"");
//删除所有class=""样式
//div.removeAttribute("class");
//删除中的单个样式
div.style.cssText = div.style.cssText.replace(/red/,"blue");
//删除中的所有样式
//div.style.cssText = "";
}
</script>
</body>
</html>
The above content is a detailed explanation of JavaScript operating class and style code. I hope it will be helpful to everyone.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
