Course Introduction：Use HTML5DragandDrop API to implement web drag and drop without the need for external libraries. 1. Make elements draggable by setting draggable="true"; 2. Use the dragstart event to store drag data; 3. Add dragover and drop event processing in the drop area to accept drag and drop; 4. Optionally provide drag and drop visual feedback through CSS and JavaScript; 5. Pay attention to calls to e.preventDefault(), single transfer restrictions and browser compatibility issues.
2025-06-28 comment 0 783
Course Introduction：HTML5 natively supports drag and drop function, and interacts by setting draggable attributes and listening to dragstart, dragover, and drop events. 1. Set the element draggable="true" to enable drag; 2. Use dataTransfer.setData() to pass data in dragstart; 3. The target area listens to the dragover and blocks the default behavior to allow placement; 4. Get data and process content in the drop event; precautions include cross-domain restrictions, visual feedback, mobile compatibility and file upload support. Mastering these key points can achieve basic drag-and-drop interaction.
2025-07-15 comment 0 133
Course Introduction：dragstart, dragover and drop are key events that implement drag and drop interactions. dragstart is triggered when the user starts to drag elements, and is used to set drag data and visual feedback; dragover is continuously triggered when dragging through the target area, and must call e.preventDefault() to allow placement and can be used to add highlighting; drop is triggered when releasing the mouse key, and is used to obtain data and execute corresponding logic, and the temporary style needs to be removed. In addition, to ensure that the element is draggable, the draggable property must be set to true.
2025-06-27 comment 0 914
Course Introduction：The key to using CSSGrid to achieve a cascade layout is the cooperation of grid-area and z-index. 1. Set the row and column ranges of different elements through grid-area to make them overlap in position; 2. Use position and z-index to control the stacking order of elements to let specific elements be displayed on the upper layer; 3. You can combine translucent background to achieve visual fusion effect; 4. For complex layouts, you can use grid-template-areas to name areas to simplify the structure, and manually specify the coverage area through grid-area. Mastering these methods can flexibly achieve various stacked layout effects.
2025-07-13 comment 0 870
Course Introduction：mask-image is an attribute in CSS to apply an image as a mask layer to an element. It controls which parts of the element are visible through the transparency (alpha channel) or brightness (grayscale value) of the image, where the white area fully displays the element, the black area hides the element, and the gray area displays the translucent effect. Common uses include creating custom shapes, displaying content progressively, and designing overlay visual effects. When using it, it is recommended to use PNG images with transparency, and combine mask-repeat, mask-position and mask-size properties to adjust the mask performance. Pay attention to browser compatibility issues and provide alternative styles. For example: .masked{background:url('p
2025-06-30 comment 0 384
Course Elementary 13770
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Course Elementary 82280
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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.
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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.
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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.
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