Javascript enumerate object value: the difference obj.key vs obj[key] -

-

इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 10 उत्तर

किसी ऑब्जेक्ट के जरिए दोबारा, Obj.key का उपयोग करके संदर्भ मान सभी "अपरिभाषित" मिलता है जबकि obj [key] ठीक काम करता है वे समान नहीं हैं वे नहीं हैं? क्या मुझे कुछ याद आ रहा है?

jsfiddle लिंक: 

  फ़ंक्शन इटरेट ओबज (obj, callback) {if obj == null || type ob ob! = "Object") { वापसी; } के लिए (obj में var कुंजी) {// कॉलबैक (कुंजी, obj [कुंजी]); Console.log ("obj.key --- & gt;" + obj.key); Console.log ("obj [key] --->" + obj [कुंजी]); // कॉलबैक (कुंजी, ओबीजे.की); "दूसरा": {दूसरे: "1", दूसरे 1: "3", दूसरा 2: "अन्य": " 2 "}, अंत:" foo "} फिर से ओबज (नमूना, फ़ंक्शन (कुंजी, मान) {// console.log (" कुंजी: "+ + +", "+" मान: "+ मान);})

नहीं वे समान नहीं हैं जब आप ऑब्जेक्ट पर प्रॉपर्टी लुकअप कर रहे हैं और जो संपत्ति आप देख रहे हैं, या इस उदाहरण में 'कुंजी' में कुछ और के लिए एक प्लेसहोल्डर है, तो आपको ब्रैकेट नोटेशन का उपयोग करने की आवश्यकता है उदाहरण के लिए, आपके लूप में 'कुंजी' आपके ऑब्जेक्ट की वास्तविक कुंजी के लिए एक प्लेसहोल्डर है। जब आप ऑब्जेक्ट पर गुणों को एक्सेस कर रहे हैं और डॉट के दायीं ओर की बात है तो संपत्ति का वास्तविक नाम या आपके उदाहरण में, sample.start


Comments

Post a Comment

Popular posts from this blog

c# - SignalR: "Protocol error: Unknown transport." when navigating to hub -

-
Image
I am trying to use the ASP.NET signal for the first time - here's what I did: created a new web Has been added to the project and the following signal R packages: I have created the following category: [Hub-name ("chat")] Public class ChatHub: Hub {Public Zero Halo () {Clients.All.hello ( ); }} and the following startup configuration: public partial class startup {public zero configuration (IAppBuilder app) {configure (app); App.MapSignalR (); }} However, whenever I navigate localhost: (port) / api / signalr / chat I get the following error: Protocol error: Unknown transport. I am running a new browser and trying different people so remove it from the API / URL, and just use the localhost: (potter) / signaller / Chat
Read more

Camel ProducerTemplate possible memory leak -

-
To some degree, this is a bit of a shot in the dark, but we have a process that is dramatically slow One day's course we have found that all the things running on the fuses begin to draw, but when we are running a specific process, JPPropellers are going on, I have found that the increase in magnetic usage increases over time. . Org.apache.camel.ProductTemplate.Send So my main question is, is the way in which the manufacturer product is being used here which is wrong / can this be a problem? exchange foo = new DefaultExchange (getCamelContext (), ExchangePattern.InOnly); Foo.getIn () setBody (obj). Root R = Exchange .getContext (). GetRoute ("do_something_fun"); Creator Template Template = exchange.getContext () CreateProducerTemplate (); Template.send (r.getEndpoint (), foo); Generally, you should not create a productive template on each request as described here: / P> However, because I do not have a complete picture of your application, so you can cr...
Read more

javascript - Adhering to a max length setting with jshint -

-
I get several recommendations to compile a maximum of 80 characters when writing javascript, e.g. Google, NPM, Node. JS, Crockford In some cases, though, I do not think how best to do this. MongoClient.connect ('mongodb: // localhost: 27017 / sampleDatabase', function (mistake, database) {if (err)} {throw error;} db = database;}); This will throw a jshint warning because it exceeds 80 characters. Now, do you choose to ignore the warning in this example, or instead choose an option for a solution like MongoClient.connect ('mongodb: // localhost: 27017 / sampleDatabase' , Function (err, database) {if (err) {throw error;} db = database;}); If you can reuse the url variable So, great option if this is a shot, as is often such a call, I would probably do something like this ... / * jslint sloppy: true, white: true, browser: True, maxlen: 80 * / / * global mongo client * / var dbarhh, db; DbErrHand = function (mistake, database) {if (err) {throw error; } ...
Read more