The only way to pass scope keys across multiple components is through method calls.

跨多个组件传递范围键的惟一方法是通过方法调用。

youdao

You can't access it through a pointer declared as an Order, nor can you pass it to another method expecting an Order as an argument.

您不能通过声明为Order的指针来访问它，您也不能将它传递到另外一个希望以Order作为参数的方法。

youdao

When you don't need to pass data along through send , then just pass null as the argument to this method.

如果不需要通过send传递数据，则只要传递null作为该方法的参数即可。

youdao