function student(props){this.name=props.name || '匿名';//默認(rèn)是匿名this.grade=props.grade || 1;}student.prototype.hello=function(){console.log('hello ' this.name);}function createStudent(props){return new student(props||{})}var xiaoming=createStudent({name:'xiaoming'});xiaoming.hello();//hello xiaoming

傳進(jìn)一個數(shù)組?

function animal(name,age,grade){this.name=name;this.age=age;this.grade=grade;}animal.prototype.hello=function(){console.log('hello ' this.name);}var chicken=new animal('chicken',3,12);chicken.hello();//hello chicken

我理解的構(gòu)造函數(shù)就是用new()實(shí)例化去構(gòu)造

?

看了原型繼承，發(fā)現(xiàn)原型繼承不了

所以就看代碼

function student(name){this.name=name||'unname';}student.prototype.hello=function(){console.log('hello' this.name)}function cat(grade){student.call(this,grade);this.grade=grade||12}var a=new cat()//a.name=unname,a.grade=12,a.hello() is not a function不可以繼承student的原型， function f(){}f.prototype=student.prototype;cat.prototype=new f()var b=new cat();//b.name=unname,b.grade=12,b.hello()='hello unname'可以繼承student的原型

通過call來調(diào)用繼承，并綁定this

?也可以用class來extends

class student{constructor(name){this.name=name}hello(){console.log('hello' this.name)} } class cat extends student{constructor(name,grade){super(name);this.grade=grade;}myGrade(){console.log('my grade is' this.grade)} } var a=new cat() //a.name,a.hello(),a.grade,a.myGrade()都能用

?

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