javascript - dot-notation vs. bracket notation -


this question has answer here:

i have javascript function:

function test() {   var xhr = new xmlhttprequest();   xhr.onreadystatechange = function() {     if (xhr.readystate==4 && xhr.status==200) {       var obj = json.parse(xhr.responsetext);       document.title = obj.page_title;     }   }   xhr.open("get", "title.php", true); xhr.send(); }

my question difference between: obj.page_title , obj["page_title"] work fine me , return same value.

the 2 same:
https://developer.mozilla.org/en-us/docs/web/javascript/guide/working_with_objects

the brackets option useful if want use variable:

var key = 'page_title'; obj[key];

or if attribute names have unusual characters spaces in them:

var obj = {     'title of page': 'title' }  obj.'title of page' // wrong obj['title of page'] // right

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