OptionalendThe index at which masking ends (exclusive). A negative value counts from the end of the string. Default is -4. 掩码结束位置(不包含),负数表示从字符串末尾计数,默认为 -4
OptionalmaskThe character used to mask the string. Default is ''. 用于掩码的字符,默认为 ''
OptionalstartThe index at which masking starts (inclusive). Default is 3. 掩码开始位置(包含),默认为 3
Options for the mask function.
mask 函数的选项。