深度复制JavaScript对象

Object.prototype.deepClone = function () {
if(window.JSON){
return JSON.parse(JSON.stringify(this));
}else{
function DeepClone () {};
DeepClone.prototype = this;
var clone = new DeepClone();

for(var i in this){
if(this.hasOwnProperty(i)){
clone[i] = typeof this[i] === 'object' ? this[i].deepClone() : this[i];
}
}

return clone;
}
}

var obja = {
fn: function () {
console.log(a);
}
};

var objb = obja.deepClone();

console.log(obja);
console.log(objb);

var arr1 = [{a:1},{b:2}];
var arr2 = arr1.deepClone();
arr1[0].a = 3;
arr2[1].b = 4;

console.log(arr1);
console.log(arr2);
console.log(arr1 === arr2);