function - How is this called in JavaScript / Node? -


i'll post 2 quick examples , i'd know how these called

$.post('/path/to/file', {param1: 'value1'}, function(data, textstatus, xhr) { /*optional stuff after success */ });

in post function there's third parameter, function, data, textstatus , xhr available used within function, how called? use them time, feel still not understand "usage" or whole thing, mean, how can third parameter return or make 3 parameters of inner function available?

$.post (along $.get, $.ajax etc) jquery's "sugar" on top of xmlhttprequest api. third argument, function, known callback, , called once request has completed request response argument(s). simplified version this:

function post(endpoint, params, callback) {   var http = new xmlhttprequest();   var url = endpoint;   var params = params;   http.open("post", url, true);   http.setrequestheader("content-type", "application/x-www-form-urlencoded");   http.onreadystatechange = function() {     if (http.readystate == 4 && http.status == 200) {        // callback called text (and other parameters)       // passed in arguments       // jquery returns textstatus, , jqxhr object       // https://api.jquery.com/jquery.post/       callback(http.responsetext));     }   }   http.send(params); }

and it's used in same way $.post.

post('http://example.com/post', {}, function (text) {   console.log(text); });

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