如果业务逻辑不是特别复杂,其开销最大的过程通常是 DOM Rendering,而且,随着列表越来越长,Rendering 的时间会越来越长。 Profiling 长列表渲染的优化思路 使用createDocumentFragment/innerHTML替换createElement 相关文档:DocumentFragment - Web API | MDNcreateDocumentFragment - Web API | MDN 像React 的Virtual DOM一...
Conditional rendering 在React 中,没有用于书写条件表达式的特殊语法。相反,你只需使用常规的 JavaScript 条件表达式即可。例如,你可以使用 if 语句来根据条件包含不同的 JSX 代码: let content; if (isLoggedIn) { content = <AdminPanel />; } else { content = <LoginForm />; } return ( {content}...
map(person => {person} ); return {listItems}; } 注意上面的沙盒可能会输出这样一个控制台错误: Console Warning: Each child in a list should have a unique “key” prop. 等会我们会学到怎么修复它。在此之前,我们先来看看如何把这个数组变得更加结构化。 对数组项进行过滤 让我们把 people 数组...
console.log("App is rendering"); return ( React重新渲染示例 {/* 向列表组件传递数组作为属性值 */} <List items={items} /> ); } export default App; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28...
在 Rendering large lists with React Virtualized 一文中介绍了怎么通过 react-virtualized 来做长列表数据的渲染优化,并详细介绍通过 AutoSizer 和 CellMeasurer 组件来实现 List 组件对列表项动态高度的支持:AutoSizer:可以自动调整其子组件大小(高度和宽度)的高阶组件CellMeasurer:会自动计算组件的大小(高度和宽度)...
Create a circular list. update.next = update; } else { update.next = pending.next; pending.next = update; } sharedQueue.pending = update; } 实际上此时的update被存储在updateQueue的shared.pending字段中。 scheduleWork启动 scheduleWork的启动代码位于packages/react-reconciler/src/ReactFiberWorkLoop....
React - Rendering a Component 11. 错误的为元素绑定事件 问题描述 import { Component } from "react"; export default class HelloComponent extends Component { constructor() { super(); this.state = { name: "Chris1993", }; } update() { this.setState({ name: "Hello Chris1993!" }); } r...
simpleThis type is...simple. It will not cache item sizes or remove items that are above the viewport. This type is sufficient for many cases when the only requirement is incremental rendering when scrolling. variableThis type is preferred when the sizes of the items in the list vary. Suppl...
React - Rendering a Component 11. 错误的为元素绑定事件 问题描述 代码语言:jsx AI代码解释 import { Component } from "react"; export default class HelloComponent extends Component { constructor() { super(); this.state = { name: "Chris1993", }; } update() { this.setState({ name: "Hello...
TheshallowComparemethod will detect changes to any props, even if they aren't declared aspropTypes. This means you can also pass through additional properties that affect cell rendering to ensure changes are detected. For example, if you're usingListto render a list of items that may be re-...