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\', s

Answer 1

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'