How to reuse jquery

jQuery is a very popular JavaScript library that can greatly simplify the work of Web front-end development. However, in actual development work, we will find that a lot of code will be used repeatedly. At this time, it is very necessary to reuse jQuery code, which can greatly improve our work efficiency. So, how can jQuery be reused?

1. Define function

When writing jQuery code, we can encapsulate a commonly used code into a function and define it in a separate js file. In this way, when you need to use this code, you only need to introduce this file in the required page to complete the reuse of the code.

For example, an effect we often use is to change the style of an element when the mouse is hovering over it. We can write a function first, and then call this function in the page we need to use:

function hoverChangeStyle(element) {
  element.hover(function() {
    $(this).css('color', 'red');
  }, function() {
    $(this).css('color', 'black');
  });
}

hoverChangeStyle($('.my-element'));

In this way, we only need to call the hoverChangeStyle function after introducing this js file, and it can be achieved Code reuse.

2. Create plug-ins

In addition to defining functions, we can also encapsulate commonly used code by creating plug-ins for easy use in other pages.

jQuery plug-ins are special functions that allow us to encapsulate commonly used code. Think of this code as custom tags or classes so that it can be reused in any page.

The following is a simple jQuery plug-in example:

(function ($) {
  $.fn.changeColor = function () {
    return this.each(function () {
      $(this).css('color', 'red');
    });
  };
}(jQuery));

The method of using this plug-in is very simple:

$('.my-element').changeColor();

In this way, we successfully encapsulate a commonly used code into Create a plug-in and easily reuse it in other pages.

3. Use template libraries

When we need to reuse some HTML-related code, we can use some template libraries, such as: Handlebars.js, Mustache.js, etc. These template libraries can help us better organize template code and support more advanced functions, such as conditional statements, loop statements, etc.

When using Handlebars.js, we can first define the template and then fill in the content where we need to use it. The following is a simple Handlebars.js example:

<div id="container"></div>

<script id="user-template" type="text/x-handlebars-template">
  {{#each users}}
    <div class="user">
      <h2>{{ name }}</h2>
      <p>{{ age }} years old</p>
    </div>
  {{/each}}
</script>

Next, we need to introduce the Handlebars.js library into the page and write JavaScript code:

var users = [
  {
    name: '张三',
    age: 20
  },
  {
    name: '李四',
    age: 21
  },
  {
    name: '王五',
    age: 22
  }
];

var userTemplate = Handlebars.compile($('#user-template').html());
$('#container').html(userTemplate({users: users}));

In this way, we successfully Encapsulate a commonly used HTML code into a template library and easily reuse it in other pages.

Summary

The above are several common jQuery code reuse methods. We can choose the method that suits us according to actual needs. Through code reuse, we can improve development efficiency, reduce duplication of work, and better maintain code.

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