How to use html to create dynamic web pages

html is a markup language used to write web pages. It can create static web pages or dynamic web pages. Dynamic web pages can perform real-time data interaction and page rendering based on user interaction behaviors, improving user experience. This article will introduce in detail how to use html to create dynamic web pages.

1. The principle of dynamic web pages

html can create static web pages, but to create dynamic web pages, you need to use some technologies, such as javascript, CSS, AJAX, etc. Among them, JavaScript is one of the most important technologies for realizing dynamic web pages. It is a scripting language that can achieve real-time data interaction and page rendering in web pages. CSS can control the style and layout of web pages to make them more beautiful.

AJAX is a technology used to create asynchronous web applications that can interact with the server and dynamically update page content without reloading the entire web page. Using AJAX can improve the response speed and user experience of web pages.

2. Use javascript to create dynamic web pages

1. Dynamicly change text content

nbsp;html>


  <title>JavaScript动态网页</title>
  <script>
    function changeText() {
      document.getElementById("text").innerHTML = "Hello, World!";
    }
  </script>


  <h1 id="JavaScript动态网页">JavaScript动态网页</h1>
  <button>点击此处以改变文本内容</button>

In the above code, the document object and getElementById method of javascript are used. Get the h1 element in the web page and dynamically change its content.

2. Dynamicly change the image source

nbsp;html>


  <title>JavaScript动态网页</title>
  <script>
    function changeImage() {
      var image = document.getElementById("image");
      if (image.src.match("dog")) {
        image.src = "cat.jpg";
      } else {
        image.src = "dog.jpg";
      }
    }
  </script>


  <h1 id="JavaScript动态网页">JavaScript动态网页</h1>
  <img  src="/static/imghwm/default1.png" data-src="dog.jpg" class="lazy" alt="How to use html to create dynamic web pages" >
  <br>
  <button>点击此处以改变图片</button>

In the above code, the if statement and match method of javascript are used to determine the current image source, and then dynamically change the image source.

3. Use AJAX to create dynamic web pages

AJAX can interact with the server and dynamically update the page content without reloading the entire web page, making the web page more efficient and user-friendly. friendly.

The following is an example of using AJAX to obtain data from the server:

nbsp;html>


  <title>AJAX动态网页</title>
  <script>
    function loadXMLDoc() {
      var xmlhttp = new XMLHttpRequest();
      xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            document.getElementById("text").innerHTML = this.responseText;
        }
      };
      xmlhttp.open("GET", "data.txt", true);
      xmlhttp.send();
    }
  </script>


  <h1 id="AJAX动态网页">AJAX动态网页</h1>
  <button>点击此处以获取数据</button>
  <div></div>

In the above code, the XMLHttpRequest object of AJAX is used to request data from the server. After obtaining the data, it is dynamically updated using javascript. Web content.

4. Use CSS to beautify dynamic web pages

CSS can control the style and layout of web pages to make them more beautiful. The following is a simple CSS style example:

nbsp;html>


  <title>CSS样式动态网页</title>
  <style>
    h1 {
      color: red;
      text-align: center;
    }

    button {
      background-color: blue;
      color: white;
      font-size: 16px;
      border-radius: 5px;
      padding: 10px;
    }
  </style>


  <h1 id="CSS样式动态网页">CSS样式动态网页</h1>
  <button>点击此处</button>

In the above code, CSS style rules are used to control the title and button styles in the web page.

To sum up, you can easily create dynamic web pages using HTML. By using technologies such as javascript, AJAX and CSS, you can make web pages more efficient, beautiful and user-friendly. Of course, there are many other technologies and tools that can be used to create dynamic web pages, and readers can learn more about them and study them in depth.

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