Returns null if called outside the scope of a catch block 如果在catch块作用域以外调用,则返回null 。
Error message may be called anywhere within the scope of a catch block Error _ message可以在catch块作用域内的任意位置调用。
Error information can be retrieved by using these functions from anywhere within the scope of the catch block 可以从catch块作用域内的任何位置使用这些函数检索错误消息。
In nested catch blocks , error line returns the error line number specific to the scope of the catch block in which it is referenced 在嵌套catch块中, error _ line返回特定于引用它的catch块作用域的错误行号。
In nested catch blocks , error number returns the error number specific to the scope of the catch block in which it is referenced 在嵌套的catch块中, error _ number返回特定于其被引用的catch块作用域的错误号。
In nested catch blocks , error message returns the error message specific to the scope of the catch block in which it is referenced 在嵌套catch块中, error _ message返回特定于它被引用catch块作用域的错误消息。
Error message returns the error message regardless of how many times it is run , or where it is run within the scope of the catch block Error _ message无论运行多少次,无论在catch块作用域内的什么位置运行,它都返回错误消息。