ajax - How to use native javascript write jquery $.getJSON function? -

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a demo want use jquery $.getjson function,but must import jquery, want use native javascript write jquery $.getjson function.

my code is:

var $={     getjson: function(url, params, callback){         var requrl = url;         var xhr = new xmlhttprequest;         xhr.onreadystatechange = function() {             if (xhr.readystate == 4 && xhr.status == 200) {                 json.parse(xhr.responsetext);             }         }         xhr.open("get", requrl);         xhr.send();     } };

use chrome show:

xmlhttprequest cannot load xxxx origin xx not allowed access-control-allow-origin.

who can me?

make ajax request , use json.parse on result. like:

xhr = new xmlhttprequest; xhr.onreadystatechange = function() {     if (xhr.readystate == 4 && xhr.status == 200) {         json.parse(xhr.responsetext);     } } xhr.open("get", url) xhr.send();

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