function wrapper(target) {

    // Define an own property "doABC"

    target.doABC = function () {

        alert('in wrapper');

    };

    return target;

}

​

function Model() {

    wrapper(this);

}

​

// Define an inherited property "doABC"

Model.prototype.doABC = function () {

    alert('in Model');

};

​

var a = new Model();

​

//Use the own property "doABC". The inherited "doABC" is ignored.

a.doABC(); 

​

delete a['doABC'];

​

a.doABC();