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It's a new feature of ECMAScript 5. John Resig wrote up a nice summary of it.

It's just a string you put in your JavaScript files (either at the top of your file or inside of a function) that looks like this:

"use strict"; 

Putting it in your code now shouldn't cause any problems with current browsers as it's just a string. It may cause problems with your code in the future if your code violates the pragma. For instance, if you currently have foo = "bar" without defining foo first, your code will start failing...which is a good thing in my opinion.

It's a new feature of ECMAScript 5. John Resig wrote up a nice summary of it.

It's just a string you put in your JavaScript files (either at the top of your file or inside of a function) that looks like this:

"use strict"; 

Putting it in your code now shouldn't cause any problems with current browsers as it's just a string. It may cause problems with your code in the future if your code violates the pragma. For instance, if you currently have foo = "bar" without defining foo first, your code will start failing...which is a good thing in my opinion.

It's a new feature of ECMAScript5. John Resig wrote up a nice summary of it.

It's just a string you put in your js files (either at the top of your file or inside of a function) that looks like this:

"use strict"; 

Putting it in your code now shouldn't cause any problems with current browsers as it's just a string. It may cause problems with your code in the future if your code violates the pragma. For instance, if you currently have foo = "bar" without defining foo first, your code will start failing...which is a good thing in my opinion.

It's a new feature of ECMAScript 5. John Resig wrote up a nice summary of it.

It's just a string you put in your JavaScript files (either at the top of your file or inside of a function) that looks like this:

"use strict"; 

Putting it in your code now shouldn't cause any problems with current browsers as it's just a string. It may cause problems with your code in the future if your code violates the pragma. For instance, if you currently have foo = "bar" without defining foo first, your code will start failing...which is a good thing in my opinion.

It's a new feature of ECMAScript5. John Resig wrote up a nice summary of it.

Strict Mode is a new feature in ECMAScript 5 that allows you to place a program, or a function, in a "strict" operating context. This strict context prevents certain actions from being taken and throws more exceptions (generally providing the user with more information and a tapered-down coding experience).

It's a new feature of ECMAScript5. John Resig wrote up a nice summary of it.

It's just a string you put in your js files (either at the top of your file or inside of a function) that looks like this:

"use strict"; 

Putting it in your code now shouldn't cause any problems with current browsers as it's just a string. It may cause problems with your code in the future if your code violates the pragma. For instance, if you currently have foo = "bar" without defining foo first, your code will start failing...which is a good thing in my opinion.