Learning from scratch How to Use callback functions in jquery

In C-like languages, it is usually passed through the function pointer/reference method.

Jquery also provides a similar callback function mechanism. However, it is worth mentioning how to pass the callback function correctly.

1. Callback without Parameters

Copy codeThe Code is as follows:
Pai.get('myhtmlpage.html ', myCallBack );

MyCallBack is the function name. Functions are the basis of javascript. It can be passed as a reference variable.

2. Callback with Parameters

Naturally, based on our past experience, we will consider the callback with parameters as follows:

Copy codeThe Code is as follows:
Pai.get('myhtmlpage.html ', myCallBack (param1, param2 ));

However, this will not work properly. MyCallBack (param1, param2) will be executed when this statement is called, rather than after.

The following syntax is correct:

Copy codeThe Code is as follows:
Pai.get('myhtmlpage.html ', function (){
MyCallBack (param1, param2 );
});

In this way, the callback function is passed as a function pointer and will be executed after the get operation is completed.