w3css 在线编辑器 | w3css代码测试

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.cainiaomax.com/w3css/4/w3.css">
<body>

<div class="w3-sidebar w3-bar-block w3-border-right" style="display:none" id="mySidebar">
  <button onclick="w3_close()" class="w3-bar-item w3-large">Close &times;</button>
  <a href="#" class="w3-bar-item w3-button">链接 1</a>
  <a href="#" class="w3-bar-item w3-button">链接 2</a>
  <a href="#" class="w3-bar-item w3-button">链接 3</a>
</div>

<div class="w3-teal">
  <button class="w3-button w3-teal w3-xlarge" onclick="w3_open()">☰</button>
  <div class="w3-container">
    <h1>我的页面</h1>
  </div>
</div>

<div class="w3-container">
<p>此侧边栏默认隐藏，(style="display:none")</p>
<p>您必须单击“汉堡包”图标（左上角）才能将其打开。</p>
<p>侧边栏会隐藏部分页面内容。</p>
</div>

function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
}
</script>
     
</body>
</html>

报个问题: