我有一个函数,可以沿着一棵简单的树走,并在每个步骤调用函数以打印菜单:
renderMenuFx(menu, renderFx) {
renderFx.startMenu()
for (const entry of menu) {
renderFx.startEntry()
renderFx.renderEntry(entry.path.join(""), entry.title)
if (entry.menuEntries) {
this.renderMenuFx(entry.menuEntries, renderFx)
}
renderFx.endEntry()
}
renderFx.endMenu()
}
并且在登录控制台时有效:
this.renderMenuFx(tree, {
startMenu() { console.log('<ul>') },
endMenu() { console.log('</ul>') },
startEntry() { console.log('<li>') },
endEntry() { console.log('</li>') },
renderEntry(path, title) { console.log(`<a href="${path}">${title}</a>`) },
})
但是当我尝试在React中渲染它时就没有了:
<div>
{
f.renderMenu(this.tree, {
startMenu() { return ( <ul> ) },
endMenu() { return ( </ul> ) },
startEntry() { return ( <li> ) },
endEntry() { return ( </li> ) },
renderEntry(path, title) { return ( <a href={path}>{title}</a> ) },
})
}
</div>
实际上,问题在于它无法编译,给出:
./src/components/Menu/MenuDyn.js
Syntax error: Unexpected token (141:37)
139 | f.renderMenu(this.tree, {
140 | startMenu() { return ( <ul> ) },
> 141 | endMenu() { return ( </ul> ) },
| ^
我显然做错了:处理这种情况的正确方法是什么?
开始实验的简单示例:
在某些<Menu menu={someData} />
类组件中
render () {
return (
<ul>
{this.props.menu.map((entry) => (
<Entry key={entry.id} data={entry}></Entry>
))}
</ul>
)
}
渲染(功能)子组件:
const Entry = props => (
<li>
{props.data.title}
{props.data.menuEntries && (
<Menu menu={props.data.menuEntries} />
)}
</li>
)