在上面的代码中,我们使用useState Hook来创建一个名为myObject的状态变量,并将其初始值设置为一个包含空数组的对象。然后,我们定义了一个addDataToArray函数,它接受一个数据参数,并在函数内部创建一个新的数组newArray,将原数组myObject.array中的数据和新数据一起添加到新数组中。最后,我们使用setMyObject函数更...
mount: (container) => { if (container instanceof HTMLElement) { if (document.body.attachShadow) { const shadowHost = container; // 当 mode 设置为 "open" 时,页面中的 JavaScript 可以通过影子宿主的 shadowRoot 属性访问影子 DOM 的内部 const shadowRoot = shadowHost.shadowRoot || shadowHost.at...
function validateChildKeys(node, parentType) { if (typeof node !== 'object') { return; } // 检查数组中的item是否有keys if (Array.isArray(node)) { for (var i = 0; i < node.length; i++) { var child = node[i]; if (isValidElement(child)) { validateExplicitKey(child, parent...
};//定义reducer事件处理函数,它规定了一套机制,当dispatch触发不同操作时,会根据reducer的规定return不同值constreducer = (state, action) =>{if(action.type ==="ADD_ITEM") {constnewPeople =[...state.people, action.payload];return{ ...state, people: newPeople, isModalOpen:true, modalContent:...
快速上手要在你的React项目中使用 React Contexify，首先需要安装这个库：npminstall react-contexify# 或者yarnadd react-contexify安装完成后，你可以按照以下步骤创建一个基本的右键菜单：import React from'react';import { Menu, Item, useContextMenu } from'react-contexify';import'react-contexify/dist/...
item.removeChild(item.firstChild as ChildNode); } }) 这是我最近写的一段代码(略微删改),在第一页有个add-ele元素的时候就删除它。这里我们将item.firstChild断言成了HTMLDivElement类型,如果不断言,item.firstChild的类型就是ChildNode,而ChildNode类型中是不存在classList属性的,所以就就会报错,当我们把他断...
div"to="/home/movies/coming"active-class="active"class="hot-item">即将上映</router-link><trans...
Cell Decorators are an easy way to add common hover animations. For example, wrapping renderItem in the <ScaleDecorator> component will automatically scale up the active item while hovering (see example below). ScaleDecorator, ShadowDecorator, and OpacityDecorator are currently exported. Developers may...
('vertical'|'horizontal'|null)='vertical';// Layout is an array of objects with the format:// The index into the layout must match the key used on each item component.// If you choose to use custom keys, you can specify that key in the layout// array objects using the `i` prop...
When the user clicks on a todo item we will mark it as completed. Also we need a small input field on top to add new todos and on the bottom 3 filters which will allow the user to toggle between: All Completed Active Redux Reducer All data in Redux application lives inside a single ...