Browse - Programming Tips - Old - How do I get warnings about undeclared variables in javaScript?
Date: 2009jul26 Language: javaScript Q. How do I get warnings about undeclared variables in javaScript? A. In Firefox, go toabout:configAnd setjavascript.options.strict = trueThis is like perl's "use strict;". It also, helpfully, warns about variables with overlaping scope. Since this generates lots of warning from things I don't control (eg jQuery). I prefer to just turn it on occasionally.