asynccallback | 易学教程

For-loop and async callback in node.js?

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问题 I'm new to JavaScript and to node.js. I want to loop through a directory and add all file stat (not other directories) to an array. As you see below there is a problem with my code since the callback will probably get called after the for loop has finished so using the "i"-variable in the callback method will not work. But how should the code look so that the below snippet works? Does it have something to do with closures? Thanks for help! fs.readdir(SYNCDIR, function(err1, files) { var

Is Javascript synchronous(blocking) or Asynchronous(nonblocking) by default

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问题 I am trying to grasp on Javascript Asynchronous functions and callbacks. I got stuck on the concept of callback functions, where I am reading on some places: they are use to have sequential execution of code (mostly in context of jquery e.g animate)and some places specially in the context of Nodejs; they are use to have a parallel execution Asynchronous and avoid blocking of code. So can some expert in this topic please shed light on this and clear this fuzz in my mind (examples??). so I

nodeJs callbacks simple example

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问题 can any one give me a a simple example of nodeJs callbacks, I have already searched for the same on many websites but not able to understand it properly, Please give me a simple example. getDbFiles(store, function(files){ getCdnFiles(store, function(files){ }) }) I want to do something like that... 回答1: var myCallback = function(data) { console.log('got data: '+data); }; var usingItNow = function(callback) { callback('get it?'); }; Now open node or browser console and paste the above

nodeJs callbacks simple example

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can any one give me a a simple example of nodeJs callbacks, I have already searched for the same on many websites but not able to understand it properly, Please give me a simple example. getDbFiles(store, function(files){ getCdnFiles(store, function(files){ }) }) I want to do something like that... var myCallback = function(data) { console.log('got data: '+data); }; var usingItNow = function(callback) { callback('get it?'); }; Now open node or browser console and paste the above definitions. Finally use it with this next line: usingItNow(myCallback); With Respect to the Node-Style Error