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December 22, 2015 03:19
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Use Strict
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| By marking the top of the script block or function with the "use strict” directive, | |
| the compiler will provide early warnings and errors for common coding mistakes, | |
| and restrict the usage of some dark corners of the JavaScript language. | |
| Let you see how the following sample code interact with Strict Mode. | |
| Code | |
| "use strict"; | |
| a = 100; | |
| b = 200; | |
| document.write(a + b); | |
| Results | |
| Error was detected; no results were produced. | |
| Errors | |
| Uncaught ReferenceError: a is not defined | |
| Expected Code | |
| "use strict"; | |
| var a = 100; | |
| var b = 200; | |
| document.write(a + b); | |
| Results | |
| 300 | |
| Errors | |
| No errors. | |
| (Note that Strict Mode is still under development in many browsers.) |
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