<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            font-family: "Microsoft YaHei", serif;
        }

        body, dl, dd, p, h1, h2, h3, h4, h5, h6 {
            margin: 0;
        }

        ol, ul, li {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        img {
            border: none
        }
    </style>
</head>
<body>
<div id="wrap" class="goudan dachui"></div>
<script>
// 新的api，低版本
    let oWrap = document.getElementById("wrap");
    oWrap.classList.add("zhangyu");
    oWrap.classList.remove("dachui")
</script>
</body>
</html>