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copied!<blockquote> <p>Also,any one can tell me how to load the js by components?</p> </blockquote> <p>this touches on the topic of asynchronous javascript file loading. if you've ever used a language that has a way to "include" a file at any point in a script, you'll understand that javascript does not have this capability. because of that, there is this whole paradigm of "aysnc javascript addition" via script tag injection.</p> <p>script tag injection: you dynamically make a script tag, and set its source to the file you need, and insert that tag into the DOM, and voila, a new file has been loaded and executed. With javascript heavy applications, this is common, especially when loading third party applications. Google does it alllll the time, just check out google analytics' include script for a good example of this.</p> <p>Now, since this is a touchy and delicate type of coding to do, some "javascript component / module / asset loading" frameworks have refined it and made it pretty stable. common.js, require.js, etc have all done good jobs at this.</p> <blockquote> <p>What should I know when I write the different components ?</p> </blockquote> <p>For what you're doing with google maps, you don't really need to know much. but if you get into javascript module pattern development, you need to know this: make sure you protect your global namespace from being cluttered by your own variables, so encapsulate all of your work in closures when possible, and (recommended but not required) start them all with a <code>;</code> so they don't break each other if they get loaded out of order.</p>

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