Merge branch 'master' of https://github.com/marchtea/The-Art-Of-Programming-By-July into ch35

"merge master"
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Update chapter 8.1
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Add JavaScript implementation for chapter 04
Merge remote-tracking branch 'upstream/master'
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Merge pull request #202 from Frederick-S/master

添加第四章 JavaScript 代码
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fix the bug
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