继承原型链

 1 function SuperType() {
 2     this.property = true;
 3 }
 4 
 5 SuperType.prototype.getSuperValue = function() {
 6     return this.property;
 7 };
 8 
 9 function SubType() {
10     this.subproperty = false;
11 }
12 
13 //继承了 SuperType
14 SubType.prototype = new SuperType();
15 
16 SubType.prototype.getSuperValue = function() {
17     return this.subproperty;
18 };
19 
20 var instance = new SubType();
21 console.log(instance.getSuperValue());
22 
23 console.log(instance instanceof Object);
24 console.log(instance instanceof SuperType);
25 console.log(instance instanceof SubType);
26 
27 console.log(Object.prototype.isPrototypeOf(instance));
28 console.log(SuperType.prototype.isPrototypeOf(instance));
29 console.log(SubType.prototype.isPrototypeOf(instance));