html js method call

HTML and JavaScript are two essential technologies in web development. Through HTML markup language, we can display the page layout, while JavaScript makes the page more dynamic and interactive. This article will introduce how to call JavaScript methods in HTML.

A JavaScript method is a reusable block of code that can be called when needed. There are two main methods for calling JavaScript methods in HTML:

1. Directly calling JavaScript methods

By adding the "onclick" attribute to the HTML tag, you can directly add the "onclick" attribute to the HTML tag. Call JavaScript methods in. For example:

<button onclick="alert('Hello World!')">点击我</button>

In the above code, when the button is clicked, a "Hello World!" prompt box will pop up. onclick means "click event", and "alert('Hello World!')" is a JavaScript method, which will pop up a prompt box.

2. Calling JavaScript methods through event listeners

In addition to directly calling JavaScript methods in HTML tags, you can also call JavaScript methods through event listeners.

For example, after the page is loaded, we need to call JavaScript methods to set the page style. You can add the following code in HTML:

<script>
  window.onload = function() {
    setPageStyle();
  };
  
  function setPageStyle() {
    // ...
  }
</script>

In the above code, we call the JavaScript method named setPageStyle through the window.onload event listener after the page is loaded.

It should be noted that the above two methods call JavaScript methods in HTML, so the JavaScript code must be placed in the "<script>" tag. If the JavaScript code is large or complex, it is recommended to save it as a separate .js file and then introduce the file in HTML: </script>

<script src="js/myscript.js"></script>

In the above code, we specify the file where the JavaScript code is located through the "src" attribute path, HTML will automatically load the file and execute the JavaScript code in it. This makes HTML files cleaner and easier to maintain.

Summary

Through the above two methods, we can call JavaScript methods in HTML and make the page more dynamic and interactive. Whether you call it directly or through an event listener, you need to understand the syntax and function of JavaScript methods. In addition, in order to make the code easier to maintain, we should also use external .js files as much as possible to reduce the complexity of HTML files and code redundancy.

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