jQuery does not use anonymous inner classes

In front-end development, jQuery is a very commonly used JavaScript library. jQuery is a fast, concise JavaScript library with good cross-platform functionality, compatibility, and ease of use. jQuery makes JavaScript development on the browser side easier and faster. This article will focus on how to avoid using anonymous functions when using jQuery.

1. Defects of anonymous inner classes

When using jQuery, anonymous internal functions are a relatively common way of writing. For example:

$(document).ready(function(){
  // some code here
})

In the above code, $(document).ready() will be executed after the page document is loaded. In the parameters of this method, an anonymous function is passed as parameter. Although this method of using anonymous internal functions is simple, it has some flaws:

1. Poor readability: If the anonymous function has a lot of content, the code hierarchy will become very deep and can be Poor readability.
2. Poor reusability: If we need to reuse this function in other places in the project, then we must completely copy the function and then make some modifications, so the reusability of the code is relatively poor.
3. Debugging inconvenience: If we need to debug, debugging involving anonymous internal functions will become very inconvenient. If we need to debug an application with multiple nested functions, we need to trace the stack of function calls, which may consume a lot of time and effort.

2. Benefits of using named functions

To avoid using anonymous functions, we can define the function as a named function. The benefits of this are:

1. Better readability: Using named functions, the structure of the code will be clearer and the readability of the code will become better.
2. Better maintainability: Using named functions, the maintainability of the code will become better. We can call the same function multiple times where needed to avoid code duplication.
3. More convenient debugging: Using named functions, code debugging will become more convenient. We can put breakpoints directly in the code and view error messages.

3. Example

The following is a sample code to implement a named function:

// 定义命名函数
function showHelloWorld(){
  console.log("Hello, World!");
}

// 绑定事件到按钮上，并传递函数名称 showHelloWorld
$("#myButton").on("click", showHelloWorld);

In this code, we define a function named showHelloWorld. This function can be called wherever needed. We can pass this function to jQuery's .on() method to bind an event. The advantage of this is that we can use this function multiple times where needed. There is no need to duplicate code like using anonymous functions.

In addition, when we need to debug the code, we only need to set a breakpoint at the definition of the showHelloWorld function. This breakpoint will take effect at any time without tracking stack changes.

4. Conclusion

This article introduces the benefits of not using anonymous internal functions when using jQuery. By using named functions, we can improve the readability, reusability, and maintainability of our code. At the same time, it will become more convenient when debugging the code. Therefore, when using jQuery, we should use named functions instead of anonymous functions as much as possible to improve the quality and maintainability of the code.

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