feat(stages): 添加性能测试和虚拟DOM实现阶段
添加stage04-perf用于真实DOM操作性能对比,包含三个不同的更新策略: - innerHTML全量更新 - createElement全量重建 - 精确单节点更新 添加stage04用于模拟异步接口数据获取后的渲染演示 添加stage05实现虚拟DOM基础功能,提供VNode对象描述DOM树结构和递 归渲染函数
This commit is contained in:
12
stage05/index.html
Normal file
12
stage05/index.html
Normal file
@@ -0,0 +1,12 @@
|
||||
<!DOCTYPE html>
|
||||
<html lang='zh-cn'>
|
||||
<head>
|
||||
<meta charset='utf-8'>
|
||||
<meta name='viewport' content='width=device-width, initial-scale=1'>
|
||||
<title>Stage 05: 虚拟 DOM 初体验</title>
|
||||
</head>
|
||||
<body>
|
||||
<div id="minivue"></div>
|
||||
<script src="./index.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
73
stage05/index.js
Normal file
73
stage05/index.js
Normal file
@@ -0,0 +1,73 @@
|
||||
/**
|
||||
* Stage 05:虚拟 DOM 初体验
|
||||
* 用纯 JavaScript 对象描述 DOM 树,并编写递归渲染函数
|
||||
*/
|
||||
|
||||
/**
|
||||
* @typedef {Object} VNode
|
||||
* @property {string} type - 元素标签或 'text'
|
||||
* @property {Object<string, string>} [props] - 属性
|
||||
* @property {(VNode|string)[]} [children] - 子节点
|
||||
* @property {string} [value] - 文本内容(仅 type='text' 时使用)
|
||||
*/
|
||||
|
||||
/**
|
||||
* 渲染 VNode 树为真实 DOM 并挂载到容器
|
||||
* @param {VNode} vnode
|
||||
* @param {HTMLElement} container
|
||||
* @returns {HTMLElement | Text} 挂载的真实 DOM
|
||||
*/
|
||||
function render(vnode, container) {
|
||||
let el;
|
||||
|
||||
if (vnode.type === "text") {
|
||||
el = document.createTextNode(vnode.value);
|
||||
} else {
|
||||
el = document.createElement(vnode.type);
|
||||
// 设置属性
|
||||
if (vnode.props) {
|
||||
for (const key in vnode.props) {
|
||||
el.setAttribute(key, vnode.props[key]);
|
||||
}
|
||||
}
|
||||
// 递归渲染子节点
|
||||
if (vnode.children) {
|
||||
vnode.children.forEach((child) => {
|
||||
// 子节点可能是字符串 (自动转为文本 VNode)
|
||||
if (typeof child === "string") {
|
||||
render({ type: "text", value: child }, el);
|
||||
} else {
|
||||
render(child, el);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
container.appendChild(el);
|
||||
return el;
|
||||
}
|
||||
|
||||
/**
|
||||
* 手动构建一个卡片 VNode
|
||||
* @type {VNode}
|
||||
*/
|
||||
const userNode = {
|
||||
type: "div",
|
||||
props: { class: "user-card" },
|
||||
children: [
|
||||
{
|
||||
type: "h2",
|
||||
children: [{ type: "text", value: "姓名: 小明" }],
|
||||
},
|
||||
{
|
||||
type: "p",
|
||||
children: [{ type: "text", value: "年龄: 18" }],
|
||||
},
|
||||
{
|
||||
type: "span",
|
||||
children: [{ type: "text", value: "学生" }],
|
||||
},
|
||||
],
|
||||
};
|
||||
|
||||
const root = document.getElementById("minivue");
|
||||
render(userNode, root);
|
||||
Reference in New Issue
Block a user