Title: Using uni-app to develop wallpaper image applet: waterfall flow and lazy loading display
Introduction:
In today's mobile application market, wallpaper image applet is very popular. In order to improve the user experience, we can use the uni-app framework to develop such small programs and implement waterfall flow and lazy loading display functions. This article will introduce how to use the uni-app framework to develop a wallpaper image applet, and explain in detail the implementation methods of waterfall flow and lazy loading display.
1. Introduction to uni-app
uni-app is a cross-platform development framework based on Vue.js. It can write code once and publish it to multiple platforms at the same time, such as WeChat applet, Alipay applet, H5, etc. Using uni-app, you can quickly develop small programs and have good cross-platform compatibility.
2. Development preparation
First, we need to install the uni-app development environment. You can install and configure the uni-app development environment through command line tools or IDEs such as HBuilderX. After the installation is complete, we can create a new uni-app project and select the applet template.
3. Waterfall flow display
Waterfall flow display refers to arranging pictures on the page according to certain rules to form an effect like a waterfall flow. In uni-app, we can use flex layout and CSS styles to implement waterfall flow display. First, we need to create a waterfall container and set it to flex layout. Then, by calculating the width and height of each image, dynamically set the style of each image so that it is arranged in the container according to the rules of the waterfall flow.
4. Lazy loading display
Lazy loading display refers to dynamically loading images when the page is scrolling to improve page loading speed and user experience. In uni-app, we can use the Intersection Observer API to implement lazy loading display. First, we need to set a placeholder for all images that need to be lazy loaded, and then listen to the page scroll event through the Intersection Observer API. When the image enters the visible area, replace the placeholder with a real image.
5. Summary
Using uni-app to develop a wallpaper image applet can quickly implement waterfall flow and lazy loading display functions. Through waterfall flow display, pictures can be arranged on the page according to the rules of waterfall flow, improving the beauty of the page; through lazy loading display, the page loading speed and user experience can be improved. I hope this article will help you understand uni-app's development of wallpaper image applet as well as waterfall flow and lazy loading display.
Scan code experience
Those who need to obtain the source code can follow WeChat public: H5 front-end development community
Reference links:
- uni-app official documentation: https://uniapp.dcloud.io/
- Intersection Observer API: https://developer.mozilla.org/zh-CN/docs/Web/API/Intersection_Observer_API