You can disable JavaScript for URLs that match a pattern by using the `nojs` keyword in your configuration file.
You can override  this (and so enable JavaScript) for URLs that match a pattern by using the `js` keyword in your configuration file.
Suppose that your configuration file contains the entries:
    nojs = com
    js = example.com
This would disable JavaScript for URLs that match the `com` pattern, unless the URLs match the `example.com` pattern.

Your configuration file can have many `nojs` and `js` entries, each for a separate URL pattern.
You can use these functions to help you manage these entries.
The `nojs` function adds a `nojs` entry if the entry does not already exist.
The `js` function adds a `js` entry if the entry does not already exist.
The `lsnojs` function lists the `nojs` entries.
The `lsjs` function lists the `js` entries.
The `rmnojs` function removes the `nojs` entries.
The `rmjs` function removes the `js` entries.
You must give the `nojs` and `js` functions an argument for the URL pattern that you want to add an entry for.
You can give the `lsnojs`, `lsjs`, `rmnojs`, and `rmjs` functions an argument to list or remove entries that match the argument.

    # Add nojs entry to configuration file.
    # usage: <nojs <url pattern
    function+nojs {
    db0
    e -c
    g/^\s*nojs\s*=\s*~1\s*$/X
    if(?) {
    ?^\s*nojs\s*=?X
    s/$/\nnojs = ~1/
    w
    config
    }
    ^
    }

    # Add js entry to configuration file.
    # usage: <js <url pattern
    function+js {
    db0
    H-
    sw+
    e -c
    g/^\s*js\s*=\s*~1\s*$/X
    if(?) {
    /^\s*nojs\s*=/X
    s/^/js = ~1\n/
    w
    config
    }
    ^
    }

    # List nojs entries in configuration file.
    # usage: <lsnojs <url pattern>
    function+lsnojs {
    db0
    e -c
    g/^\s*nojs\s*=\s*~0/
    if(?) {
    }
    ^
    }

    # List js entries in configuration file.
    # usage: <lsjs <url pattern>
    function+lsjs {
    db0
    e -c
    g/^\s*js\s*=\s*~0/
    if(?) {
    }
    ^
    }

    # Remove nojs entry from configuration file.
    # usage: <rmnojs <url pattern>
    function+rmnojs {
    db0
    e -c
    g/^\s*nojs\s*=\s*~0/d
    if(*) {
    w
    config
    }
    ^
    }

    # Remove js entry from configuration file.
    # usage: <rmjs <url pattern>
    function+rmjs {
    db0
    e -c
    g/^\s*js\s*=\s*~0/d
    if(*) {
    w
    config
    }
    ^
    }