prototype

var book=function(){

// this.prototype.inner = function () { console.log('book_inner') }这种写法是错误的

this.inner2 = function () { console.log('book_inner2')}

}

book.prototype.display=function(){

console.log('display')

};

// book.inner2()//报错

// book.display()//报错

console.log(book.prototype)

console.log(book)

let chebook=new book();

chebook.inner2()//可以执行

chebook.display()