greeting = "Hello there" warning = 'Be careful'
You may include a single quote within a double-quoted string or a double quote within a single-quoted string. But a quote of the same type must be escaped using the backslash character, like this:
greeting = "\"Hello there\" is a greeting" warning = '\'Be careful\' is a warning'
To read from a string variable, you can assign it to another one, like this:
newstring = oldstring
or you can use it in a function, like this:
status = "All systems are working" document.write(status)