HarmonyOS 鸿蒙Next：failed validation: 'undefined, null, number, boolean, string, or Object but not function, attempt to assign value type'

可以传入一个对象解决该问题

例子如下：

```

export interface Params {
  click: () => void
}

@Component
export struct Child {
  @Prop onTap: Params;

  build() {
    Text("点击父组件count+1").onClick(() => {
      this.onTap?.click();
    })
  }
}

@Component
export struct Parent {
  @State count: number = 1;

  add() {
    this.count++;
  }

  build() {
    Column() {
      Text("这里是父组件")
      Text(this.count.toString());
      Child({
        onTap: {
          click: () => {
            this.add()
          }
        }
      })

      Child({
        onTap: {
          click: this.add.bind(this)
        }
      })

      Text("下面是错误写法，this指向不正确")
      Child({
        onTap: {
          click: this.add
        }
      })
    }
  }
}

```