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Course Introduction：// Get the IDs of all selected check boxes and store them in an array var checkedIds = $('input[type="checkbox"]:checked').map(function() { return this.id; }).get(); console.log(checkedIds); FAQs about jQuery and checkbox IDs (FAQs) How to select all checkboxes using jQuery? Use jQuery to select all check boxes, you can use the ":checkbox" selector. This selection

2025-02-26 comment 0  361

Course Introduction：By joining multiple tables using the JOIN clause, grouping rows together according to common columns or expressions. Determine a common column or expression: Identifies the common column or expression to join the table. Specify the join type: Select INNER JOIN (match rows), LEFT JOIN (including all rows in the left table), RIGHT JOIN (including all rows in the right table), or FULL JOIN (including all rows in the right table). Use JOIN statement: Use JOIN statement to join tables together and match rows based on common columns or expressions.

2025-04-09 comment 0  964

Course Introduction：In SQL queries, JOIN and subqueries are key tools for handling complex data requirements. 1.JOIN is used to join multiple tables, mainly including INNERJOIN (return matching rows), LEFTJOIN (retain all rows on the left table), RIGHTJOIN (retain all rows on the right table) and FULLOUTERJOIN (retain all rows on the right table, but MySQL does not support them). When using them, you should choose the appropriate type according to your needs. 2. Subqueries are used for nested query logic and are suitable for WHERE, FROM and SELECT clauses. It is recommended to keep it concise, avoid multi-layer nesting, and select appropriate operators (such as =, IN, EXISTS) according to the size of the result set. 3.JOIN can be used in combination with subqueries, for example

2025-07-24 comment 0  877

Course Introduction：This tutorial explains in detail how to use jQuery to implement the all and anti-select functions of check boxes in multiple regions. Automatically synchronize the selected status of all sub-check boxes in that area by setting the Select All checkbox for each independent area and listening for its status changes. At the same time, it also covers how to dynamically update the status of the "Select All" check box when the status of any sub-check box in the area changes to ensure the integrity and consistency of the user interface logic.

2025-07-23 comment 0  770

Course Introduction：Use tr:nth-child(odd) and tr:nth-child(even) to achieve table interlaced color discoloration. 1.tr:nth-child(odd) select all odd rows, 2.tr:nth-child(even) select all even rows, 3. If the table structure is complex (such as including or merging cells), it is recommended to limit the scope of action such as tbodytr:nth-child(odd) or use JavaScript to dynamically add class name control styles, 4. Manually adding class="alt" to the row and defining background color through .alt is also a stable alternative, but additional HTML logic is required.

2025-06-29 comment 0  866

Course Elementary  13795

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82321

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13157

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24603

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27463

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.