About Object's Property Name

How to add a property to an object when the property name come from a var? var obj={}; var propName='realName'; obj.propName; //wrong obj.'realName'; //wrong

Solution 1:

You can use square bracket notation:

var obj = {};
var propName = "realName";
obj[propName] = "foo";  // Same as `obj.realName = "foo";`