Detailed description of the use of get method in JQuery 3.2.1

JQuery is an excellent JavaScript library that is often used in web development to operate the DOM, perform asynchronous requests, handle events, etc. The most commonly used one is the get method. This article will detail the use of the get method in JQuery 3.2.1.

1. get method

The get method is one of the most commonly used methods in JQuery, which can obtain the network request for the specified URL content.

This method has many forms, including: jQuery.get( url [, data ] [, success ] [, dataType ] ) and jQuery.getJSON( url [, data ] [, success ] ). Among them, the get() method returns the jqXHR object, and the getJSON() method returns JSON data.

2. Basic syntax

The basic syntax of the get method is as follows:

$.get(url, [data], [callback], [type]);

Among them, url represents the request address, and data represents the data sent to the server by request. callback is an optional parameter, often an anonymous function, used to process data returned by the server. type indicates the data type returned by the server, and the default is xml.

3. Example

The following is a simple example of the get method for obtaining a text file:

$("#button").click(function(){
    $.get("test.txt", function(data, status){
        alert("Data: " + data + "\nStatus: " + status);
    });
});

In the above example, when the user clicks the button, Execute this function, call the get method to request the content of the test.txt file, and display the content in a pop-up window.

The following is another example of the get method, used to obtain JSON data:

$.get("data.json", function(data, status){
    alert("Data: " + data + "\nStatus: " + status);
}, "json");

In the above example, we use the get method to request the content of the data.json file and populate the data with window is displayed. Note that we specified the data type as JSON.

4. getJSON method

The getJSON method is similar to the get method, it can obtain JSON data on the server.

The following is the basic syntax of the getJSON method:

$.getJSON(url, [data], [callback]);

Among them, the url, data and callback parameters have the same meaning as the get method.

The following is a simple example:

$.getJSON("data.json", function(data){
    $.each(data, function(index, obj){
        alert(obj.name);
    });
});

In the above example, we called the getJSON method to request the content of the data.json file, and traversed the returned JSON data to obtain the name The value is displayed in a pop-up window.

5. Summary

The above is a simple example of using the get method and getJSON method in JQuery 3.2.1. Through these examples, we can see the basic use of these two methods. I believe that this knowledge is necessary for web developers who want to learn JavaScript further.

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