JavaScript - constructor parameters and prototype inheritance

Question

I am using this type of code for inheritance. The problem is i am getting error when set up prototype of B, because new A() tries to access params.param and params is undefined when setting up B.prototype. How to deal with it? Or i should use another style for simulating inheritance in js?

function A(params) {
  this.param = params.param; // this will throw error when set up B prototype
}

function B(params) {
  A.call(this, params); // this is ok
}

B.prototype = new A(); // this is bad, A need some parameters

Possible dup of stackoverflow.com/questions/7533473/… and stackoverflow.com/questions/7785955/… and stackoverflow.com/questions/3601932/… — jfriend00
– jfriend00, Commented Dec 14, 2013 at 3:32

ucdream · Accepted Answer · 2013-12-14 04:39:00Z

0

you can do this way and won't get the problem.

var EmptyFunc = function() {};
EmptyFunc.prototype = A.prototype;

B.prototype = new EmptyFunc;

answered Dec 14, 2013 at 4:39

ucdream

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