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Defrag Tools: #37 - JavaScript - Part 1

27 minutes, 24 seconds


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In this episode of Defrag Tools, Andrew Richards, Amanda Silver and Larry Larsen start walking you through the debugging of JavaScript Windows Store applications with Visual Studio. Amanda is a Principal developer for the JavaScript engine used in Internet Explorer, Windows Store applications and Visual Studio.

[00:54] - Debugging a JavaScript Windows Store application
[02:30] - Catching Crashes (unhandled exceptions)
[04:25] - WinJS.Utilities.startLog
[05:22] - app.onerror
[09:30] - Stacks
[11:47] - e.detail.error.stack
[14:23] - use strict
[20:25] - www.jslint.com integrated in VS
[22:13] - "Pin" bug
[24:58] - tile vs. title - Lint cannot detect this
[26:50] - Next time... more JavaScript debugging!


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  • Oops, something didn't work.

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    Thank you.

    good to know of "use strict"; a feature that will certainly help. It'd be nice to be able to turn off on a per file basis. For example, in in the beginning of legacy files one can put "use strict not"; or something similar.


  • EdwardEdward

    Can you apply "use strict" to the entire Java engine? (like you would server side with C# with web.config)
    It seems to be a great way to do final runtime checks on your farm of test machines - that, as you say, might concat' in a different order.

  • meutineemeutinee

    My computer graphics,. arent working correctly. dont want to bother anyone...neither is wmp pics nor will any devices be recognized. was working two weeks ago. all but wmp. i have java and flashplayer intalled and active x disabled. what should i do???!

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