当访问未初始化的属性时，Persevere会自动从服务器请求正确的数据，然后再继续执行。
When an uninitialized property is accessed, Persevere automatically requests the correct data from the server and then resumes execution.
当访问未初始化的属性时，Persevere会自动从服务器请求正确的数据，然后再继续执行。
When an uninitialized property is accessed, Persevere automatically requests the correct data from the server and then resumes execution.
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