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What did the new operator do? Interview

2022-07-18 22:16:00 【Big chicken legs are best】

Function. prototype. a=() => alert( 1)
   Object. prototype. b=() => console.log( 2)
   function A(){}
   const a= new A()
   console. log( A.prototype)
   a. a()
   a. b()

The output is as follows

In fact, you typeof a by object

new Operators will experience the following 4 A step

Create a new object ;
Assign the scope of the constructor to the new object （ therefore this It points to this new object ）;
Execute code in constructor （ Add properties for this new object ）;
Return to new object ;

therefore a Is an instance object , His __proto__ Pointing to object.prototype, So you can only access the arrow function b

But can you access it b()

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