2023-03-04 将虚拟dom渲染成真实dom
2023-03-03 本文已影响0人
Rascar
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<script>
const objs = {
tag: "div",
attrs: {
id: "app",
},
children: [
{
tag: "span",
children: [
{
tag: "h1",
color: "red",
},
],
},
{
tag: "span",
children: [
{
tag: "h1",
},
],
},
],
};
function render(vnode) {
//创建一个元素
const app = document.createElement(vnode.tag);
// 判断是否添加属性
if (vnode.attrs) {
Object.keys(vnode.attrs).forEach((key) => {
// console.log(key);
const value = vnode.attrs[key];
app.setAttribute(key, value);
});
}
//
//先递归调用
vnode.children &&
vnode.children.forEach((item) => {
app.appendChild(render(item));
});
return app;
}
document.body.appendChild(render(objs));
</script>
</body>
</html>
