Strict Mode is a new feature in ECMAScript 5 that allows you to place a program, or a function, in a “strict” operating context.
Strict mode improves JavaScript code by enforcing better programming practices and eliminating some of the language’s insecure and ill-advised features. Strict mode is enabled by adding the following directive to your code:
read more: http://www.360logica.com/blog/2014/09/strict-mode-ultimate-feature-secure-javascript.html












