怎么取proxy对象值代码实现
时间: 2023-05-21 09:03:34 浏览: 52
您可以使用以下代码来获取代理对象的值:
local proxy = newproxy(true)
local mt = getmetatable(proxy)
mt.__index = function(table, key)
print("Getting value for key:", key)
return "Value for key: " .. key
end
print(proxy.foo)
-- Output: Getting value for key: foo
-- Value for key: foo
请注意,这只是一个示例代码,实际上您需要根据您的具体情况来编写代码。
相关问题
在vue3中如何取proxy的值
在Vue 3中,当使用Vuex获取对象类型的state时,会返回一个Proxy对象。要获取Proxy对象中的真实值,可以使用Vue提供的toRaw()方法。这个方法可以获取Proxy对象的原始对象。例如,如果你想获取store.state.menuList的原始对象,可以使用以下代码:
```javascript
import { toRaw } from 'vue'
var list = toRaw(store.state.menuList)
```
这样,变量`list`将包含`store.state.menuList`的原始对象,而不是Proxy对象。\[2\]
#### 引用[.reference_title]
- *1* *2* [vue3中的对象时为proxy对象,如何获取值](https://blog.csdn.net/H_jrqn/article/details/127527894)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [vue3中获取proxy包裹的数据](https://blog.csdn.net/weixin_45039579/article/details/123921970)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]
Proxy.newProxyInstance的实现代码
Proxy.newProxyInstance的实现代码是:
```
public static Object newProxyInstance(ClassLoader loader,
Class<?>[] interfaces,
InvocationHandler h)
throws IllegalArgumentException
{
Objects.requireNonNull(h);
final Class<?>[] intfs = interfaces.clone();
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkProxyAccess(Reflection.getCallerClass(), loader, intfs);
}
/*
* Look up or generate the designated proxy class.
*/
Class<?> cl = getProxyClass(loader, intfs);
/*
* Invoke its constructor with the designated invocation handler.
*/
try {
if (sm != null) {
checkNewProxyPermission(Reflection.getCallerClass(), cl);
}
final Constructor<?> cons = cl.getConstructor(constructorParams);
final InvocationHandler ih = h;
if (!Modifier.isPublic(cl.getModifiers())) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
cons.setAccessible(true);
return null;
}
});
}
return cons.newInstance(new Object[]{h});
} catch (IllegalAccessException|InstantiationException e) {
throw new InternalError(e.toString(), e);
} catch (InvocationTargetException e) {
Throwable t = e.getCause();
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
} else {
throw new InternalError(t.toString(), t);
}
} catch (NoSuchMethodException e) {
throw new InternalError(e.toString(), e);
}
}
```
希望能够帮到您。