JS prototype chain

Prototype chain learning

1、 IE11 And Google __proto__ Change of direction

// Change direction __proto__ The direction of 
			var obj1={
				a:1,
				b:2
			}
			var obj2=Object.create(obj1)// Appoint obj2 The prototype object of is obj1
			console.log(obj1.__proto__)// The prototype chain points to Object.prototype
			console.log(obj2.__proto__)// The prototype chain points to obj1

2、 compatible ie11 Let's point to the problem

// compatible ie11 Let's point to the problem ( My own ie)
//ie Prototype mechanism , But there is no prototype chain 
			var obj1={
				a:1,
				b:2
			}
			var obj2=Object.create(obj1)// Appoint obj2 The prototype object of is obj1
			console.log(obj1.__proto__)// The prototype chain points to Object.prototype
			console.log(obj2.__proto__)// The prototype chain points to obj1

3、 Delete __proto__ Point to

// Delete 
//null： Release object 
		var obj1={a:1,b:2}
		obj1.__proto__=null
		console.log(obj1.toString())

4、 Use of custom methods in prototypes

// Capitalize the first letter 
String.prototype.shuozimudaxie=function(){
		return this[0].toUpperCase()+this.slice(1)
}		
var str="akjkjkjkjkjkjkjkjk".shuozimudaxie();
console.log(str);