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__proto__
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| var animal = { eats: true } | |
| var rabbit = { jumps: true } | |
| rabbit.__proto__ = animal // inherit | |
| console.log(rabbit.eats) // true | |
| var animal = { eats: true } | |
| rabbit = Object.create(animal); | |
| // true | |
| console.log(rabbit.eats); |
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| function Animal() { | |
| this.name = 'wangcai'; | |
| } | |
| function Dog() {} | |
| Dog.prototype = new Animal(); | |
| var d1 = new Dog(); | |
| console.log(d1.name); | |
| console.log(d1 instanceof Animal); | |
| // change the prototype of Class | |
| Dog.prototype = { | |
| name: 'yingcai' | |
| }; | |
| // now instanceof ?? | |
| console.log(d1 instanceof Dog); | |
| console.log(d1 instanceof Animal); | |
| console.log(Animal.prototype.__proto__ === Object.prototype); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="instanceof cross iframe" /> | |
| <meta charset="utf-8"> | |
| <title>instanceof cross iframe</title> | |
| </head> | |
| <body> | |
| <iframe id="fr" ></iframe> | |
| <script> | |
| var fr = document.getElementById('fr'); | |
| var arr = []; | |
| var ArrayFr = fr.contentWindow.Array; | |
| var arr2 = new ArrayFr(); | |
| console.log(Object.prototype.toString.call(arr)); | |
| console.log(Object.prototype.toString.call(arr2)); | |
| console.log(arr instanceof Array); | |
| console.log(arr instanceof ArrayFr); | |
| </script> | |
| </body> | |
| </html> |
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| function Animal() { | |
| this.eat = true; | |
| } | |
| var cat = new Animal(); | |
| console.log(cat.eat); | |
| Animal.prototype.jump = true; | |
| console.log(cat.jump); | |
| Animal.prototype = { | |
| bark: true | |
| }; | |
| var dog = new Animal(); | |
| console.log(cat.bark); | |
| console.log(dog.bark); | |
| cat.__proto__ = Animal.prototype; | |
| console.log(cat.bark); |
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