本文作者：sushengmiyan
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使用cmd打包ext的时候报了一个诡异的错误。细细找来，发现是代码书写导致。现在记录一下：
错误详细信息：
[ERR] C2009: YUI Parse Error (identifier is a reserved word =>
debugger;) -- unknown-file:198775:12
[ERR] C2009: YUI Parse Error (Compilation produced 1 syntax errors. => null) --
unknown-file:2
[ERR]
[ERR] BUILD FAILED
[ERR] com.sencha.exceptions.ExBuild: Failed to compress input
[ERR] at com.sencha.tools.compressors.yui.
[ERR] YuiJavascriptCompressor$2.invoke(YuiJavascriptCompressor.java:103)
[ERR]
[ERR] Total time: 10 seconds
[ERR] The following error occurred while executing this line:
E:\workspaces\myeclipse2014\newcourt\WebRoot\.sencha\app\build-impl.xml:260: The
following error occurred while executing this line:
E:\workspaces\myeclipse2014\newcourt\WebRoot\.sencha\app\js-impl.xml:59: com.sen
cha.exceptions.ExBuild: Failed to compress input
看错误第一行就可以看出是解析 debugger的时候出错的，看我的代码，发现我调试的时候debugger写入了没有去掉，打包的时候就出现了这个错误，将debugger去掉，再重新打包，发现，程序正常打包。
