I won’t say much nonsense, I will just post the js code to you. The specific code is as follows:
<!doctype html>
<html>
<head>
<meta charset="utf-">
<title>Untitled Document</title>
<style>
.fontSize
{
font-size:px;
}
.fontWeight
{
font-weight:bold;
}
</style>
</head>
<body>
<div class="fontSize fontWeight" style="color:red">divInstance text</div>
<button onclick="changeStyle()">changeStyle()</button>
<script>
function changeStyle()
{
var div = ("div");
// = "fontSize";
// += " fontWeight";
//Delete a single class="" style// = (/fontSize/,"");
//Delete all class="" styles//("class");
//Delete a single style in style="" = (/red/,"blue");
//Delete all styles in style=""// = "";
}
</script>
</body>
</html>
The above content is all the detailed explanation of JavaScript operation class and style code, and I hope it will be helpful to everyone.