Javascript / Nodejs call 和 apply

call: 改变了函数运行的作用域，即改变函数里面this的指向
apply：同call，apply第二个参数是数组结构

例如：

this.name = 'Ab'
var obj = {name: 'BBC'}

function getName(){
    return this.name;
}
console.log(getName.call(this))
console.log(getName.call(obj))

console:
Ab
BBC

继承功能：

function Person(name, age, sex){
    this.name = name
    this.sex = sex
    this.age = age
    this.getAge = function() {
        return this.age
    }
}

function Student(name, age, sex, grade){
    Person.call(this, name,age,sex)
　　//Person.apply(this, arguments)
    this.grade = grade
}
var stu = new Student('xiaoming', 23, 'male','one grade')

console.log(stu.name)
console.log(stu.age)
console.log(stu.sex)
console.log(stu.grade)
console.log(stu.getAge())

console: 

　　xiaoming
　　23
　　male
　　one grade
　　23

 

转载于:https://www.cnblogs.com/mypsq/p/10821032.html