how to call parent constructor?

Question

Let\'s say I have the following code snippet.

function test(id) { alert(id); }

testChild.prototype = new test();

function testChild(){}

var instance = new         


        

Answer 1

By taking advantage of variable arguments and the apply() method, you could do it this way. Here's a fiddle for this example.

function test(id) { alert(id); }
function testChild() {
  testChild.prototype.apply(this, arguments);
  alert('also doing my own stuff');
}
testChild.prototype = test;
var instance = new testChild('hi', 'unused', 'optional', 'args');