Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Auto Save

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Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

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HTML

              
                 <button data-index="1" data-target="php">php</button>
    <button data-index="2" data-target="javascript">javascript</button>
    <button data-index="3" data-target="linux">linux</button>
    <button data-index="4" data-target="html">html</button>
    <div id="php" style='display:block' class="php">
      php 是一门强大的后端脚本语言
    </div>
    <div id="javascript" class="javascript">
      javascript 是一门强大的前端脚本语言
    </div>
    <div id="html" class="html">html 是一门浏览器语言</div>
    <div id="linux" class="linux">linux 是一门强大的服务器脚本语言</div>
              
            
!

CSS

              
                 
      div {
        width: 300px;
        height: 200px;
        display: none;
        text-align: center;
        border: 1px solid #ccc;
      }
      div.php {
        background: red;
      }
      div.javascript {
        background: blue;
      }
      div.html {
        background: green;
      }
      div.linux {
        background: yellow;
      }
 
              
            
!

JS

              
                window.onload = function () {
  var aInput = document.querySelectorAll("button");
  var aDiv = document.querySelectorAll("div");
  aInput.forEach(function (val, key) {
    val.onclick = function () {
      for (var i = 0, len = aInput.length; i < len; i++) {
        aInput[i].style.background = "";
        aDiv[i].style.display = "none";
      }
      val.style.background = "red";
      document.getElementById(val.dataset.target).style.display =
        "block";
    };
  });
};

              
            
!
999px

Console