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var Constr = function(name) {
    this.name = name;
    this.method1 = function() {
        return 'Method #1';
    }
}

Constr.prototype.method2 = function() {
    return 'Method #2';
}

var a = new Constr('Ваня');

console.log(a.name);
console.log(a.method1());
console.log(a.method2());