so-called password generator

typefrequencyrequiredallowed
frequency
integer value, greater than 0, indicating the frequency of occurrence in random generation.
the larger the parameter is, the more frequently characters of the type are selected. see the source code for more detail.
required
if checked, at least one character of the type is included in the output.
allowed
can specify characters allowed to use in the output. this parameter directly concerns the occurrence probability.
output length
number of characters in the output.