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PyJS intro
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PyJS is a CommonJS Based Javascript Framework runs on Browser
Transcript of PyJS intro
A CommonJS Based Javascript Framework
runs on Browser
https://github.com/demix/pyjs
Monday, September 19, 11
CommonJS
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Math.js
increment.js
program.js(main)
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Benifits
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One code , runs everywhere
No need to study and follow an ugly module pattern
Automatic namespace
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Browser
Server
Desktop
Command line tools
...
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One code , runs everywhere
No need to study and follow an ugly module pattern
Automatic namespace
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Traditional Module Pattern
CommonJS Module
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One code , runs everywhere
No need to study and follow an ugly module pattern
Automatic namespace
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Server side Example:
NodeJS
Browser side Example:
Firefox jetpack project
Examples
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Problem
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Run directly after ‘require’.No Callback.
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Means in Browser, we can only use
“Synchronous”
request to get the script file.
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What’s the fxxk...
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SeaJS
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User pre-defined template wrapper.
Prefetch Js file which has been required.
How it works
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Problems
Still ugly template.
Still can’t download all files in parallel
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PyJS
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Grammar
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99% same as CommonJS API
No ugly user pre-defined template wrapper
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what about the file loading problem?
You haven’t mentioned it ..
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There is two loading rules in PyJS.
One in local debugging,
the other in online building.
All need Python environment.
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python pyjs.py runserver
Fetch the JS file in synchronous XHR request.
Server will parse the module file automaticly
Local debugging
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Server parse
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Online buildingpython pyjs.py
Automaticly generate a ‘boot.js’ file, find all the dependences in modules and add the information to the end of boot.js file.
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Then , if we had a combo service like:
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We can download the file just in one
request!
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Finally , because of the require function used on page has a callback, it can runs after all the files
is received and finish excuting.
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That’s all.
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More..
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Because we use python...
Local transmission
Local plugins
Deal with CSS files.
...
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demixFront-end engineer @ Baidu co.
email: [email protected]
weibo/twitter: @demix
Homepage: http://demix.github.com/
blog: http://www.cnblogs.com/demix
Monday, September 19, 11
Thank You.
Monday, September 19, 11
