如果您的匿名方法/函数是无参数的，则必须分配();

If your anonymous methods/functions are paramless, you must assign with ();

v1 := GetHandler();

在没有括号的情况下，Delphi将尝试将功能分配给变量.括号告诉它调用该函数并将函数结果分配给该变量.

Without the parentheses Delphi will try to assign the function to the variable. The parens tell it to invoke the function and assign the function result to the variable.