Course Elementary  7526

Course Introduction：AJAX stands for Asynchronous JavaScript And XML, which is asynchronous JS and XML. Through AJAX, you can send asynchronous requests to the server in the browser. The biggest advantage: obtaining data without refreshing. AJAX is not a new programming language, but a new way of using existing standards together.

Course Intermediate  11329

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17632

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Introduction：How to get the value of the tag in js: 1. js can use the innerText attribute of the object to get the value of the tag; 2. You can use the method of getting the DOM element through JS to first get the tag, and then use value, etc. to get the value of the tag.

2019-05-20 comment 0  19960

Course Introduction：In front-end development, in order to process the data entered by the user, it is usually necessary to obtain the input value of the form element. JavaScript provides some methods to get input values, let’s take a look. 1. Get the input value of the text box. The text box is one of the most common form elements. When getting its input value, you can use the value attribute. We can get the text box element through the getElementById method, and then use the value attribute to get the entered value. Sample code: ```<input type="tex

2023-04-24 comment 0  7911

Course Introduction：In PHP programming, getting the value of an array is a very common operation. However, in some cases, we will find that the value of the array cannot be obtained, which may cause an error or exception in the program. So, what are the reasons why the array value cannot be obtained? This article will analyze and give solutions. 1. The array key name is undefined or incorrectly defined. To obtain the value of the array, you must first know the corresponding array key value (also called the key name). If the key name is not defined or incorrectly defined, the array value will not be obtained. For example, the following code attempts to obtain the key name of the $arr array

2023-05-07 comment 0  734

Course Introduction：PHP arrays can get a certain value. Each value in the array has a unique key. We can use this key to access and get the value in the array. Obtaining method: 1. To obtain a specific value from an index array, you can use square brackets ([]) plus the index value to access the value; 2. To obtain a specific value from an associative array, you can use square brackets ([]) Add a key to access the value; 3. Get a specific value from the nested array, or use square brackets ([]) to access the value in the nested array.

2023-07-25 comment 0  1497

Course Introduction：How to get the value of input in JS: first use "querySelector" to get the input element, and you only need to pass the input selection rule to this method; finally, the value attribute in the input element object is the value of the input, so you only need to get Just go to this property.

2020-06-04 comment 0  10660