Instead of using a leading capital letter, Vimscript functions can also be declared with an explicit scope prefix (like variables can be, as described in Part 1).
Vimscript函数没有使用前导大写字母，相反，可以使用显式的范围前缀声明函数(类似变量，如第1部分所述)。
To turn an option on, prefix the corresponding option letter with a minus sign (for example, -f).
要开启选项，则需要在相应的选项字符前加上减号（例如，-f）。
Constructor functions which must be used with the new prefix should start with a capital letter.
必须与new共同使用的构造函数名应以大写字母开头。
Constructor functions which must be used with the new prefix should start with a capital letter.
必须与new共同使用的构造函数名应以大写字母开头。
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