How to convert string as object's field name in javascript

Question

I have a js object like:

obj = {   name: 'js',   age: 20 }; 

now i want to access name field of obj, but i can only get string 'name', so how to convert 'name' to obj's field name, then to get result like obj.name.

Thank you in advance.

Answer 1

You can access the properties of javascript object using the index i.e.

var obj = {   name: 'js',   age: 20 };  var isSame = (obj["name"] == obj.name) alert(isSame);  var nameIndex = "name"; // Now you can use nameIndex as an indexor of obj to get the value of property name. isSame = (obj[nameIndex] == obj.name) 

Check example@ : http://www.jsfiddle.net/W8EAr/

Answer 2

In Javascript, obj.name is equivalent to obj['name'], which adds the necessary indirection.

In your example:

var fieldName = 'name' var obj = {   name: 'js',   age: 20 }; var value = obj[fieldName]; // 'js'