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function merge (a, b){
if (a && b) {
for (var key in b) {
a[key] = b[key];
}
}
return a;
};
function My() {
this.sum = 0;
}
My.prototype.add = function (a, b) {
this.sum = a + b;
return this;
};
My.prototype.sub = function (b, c) {
this.sum -= b + c;
return this;
};
var my = new My();
console.log(my.add(1, 6).sub(3, 4).sum);
function Person(options) {
if(!(this instanceof Person)){
return new Person(options)
}
}
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