HarmonyOS 鸿蒙Next中谁能给几个自定义装饰器的示例
HarmonyOS 鸿蒙Next中谁能给几个自定义装饰器的示例 看了TS官网,到鸿蒙一堆报错,谁能来几个鸿蒙版的学习一下,各类型分别来一个
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鸿蒙Next中自定义装饰器的示例:
- 状态管理装饰器:
function @Observed(component: any) {
component.isStateful = true;
}
@Observed
class MyComponent {
// 组件逻辑
}
- 日志装饰器:
function @LogMethod(target: any, name: string, descriptor: PropertyDescriptor) {
const original = descriptor.value;
descriptor.value = function(...args: any[]) {
console.log(`调用 ${name} 方法`);
return original.apply(this, args);
}
}
class MyService {
@LogMethod
fetchData() {
// 获取数据
}
}
- 权限检查装饰器:
function @RequirePermission(perm: string) {
return function(target: any, name: string, descriptor: PropertyDescriptor) {
const original = descriptor.value;
descriptor.value = function(...args: any[]) {
if(checkPermission(perm)) {
return original.apply(this, args);
}
throw new Error("权限不足");
}
}
}
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