How to use JS inheritance and multiple inheritance-JS Tutorial-php.cn

How to use JS inheritance and multiple inheritance

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Release： 2018-05-28 09:46:38

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This time I will show you how to use JSInheritance and multiple inheritance, what are the precautions when using JS inheritance and multiple inheritance, the following is a practical case, let’s take a look .

Although the latest EC6 already has class-related functions, from the perspective of popularity and the need to read old code, this knowledge must be understood.

The structure of this article:

① Principle and analysis

② Application after simple encapsulation

1. Inheritance

##① Principle and analysis

First picture:

Use the idea of this code to realize inheritance, that is:

var inherit=function(objBase){
    var F=function(){}; //第一步：定义一个函数F
    F.prototype=objBase; //第二步：将传进来的基类对象(objBase)赋给函数F的原型(F.prototype)
    return new F(); //第三步：返回一个F对象(已经具备了objBase特征)
}

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② Application after simple encapsulation

Function.prototype.inherit=function(objBase){
    this.prototype=new objBase();
}
var Person=function(){
    this.name="倩倩";
    this.sex="女";
}
var Student=function(){
    this.id="0712";
}
Student.inherit(Person);
var student=new Student();
alert(student.name +","+ student.sex +","+ student.id);

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2. Multiple inheritance

① Principle and analysis

Multiple inheritance is to transfer members of multiple objects to the current object

var o1={name:"倩倩"} //对象的字面值
var o2={sex:"女"}
var She=function(){}
She.prototype={};  //先声明
for(var k in o1){
    She.prototype[k]=o1[k];
}
for(var k in o2){
    She.prototype[k]=o2[k];
}
var she=new She();
alert(she.name + "," + she.sex);

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② Application after simple encapsulation

Function.prototype.inherits=function(){
    var arr=arguments; //将接收到的arguments对象传给数组arr
    this.prototype={};
    for(var i=0;i<arr.length;i++){
      for(var k in arr[i]){
        var obj=arr[i];
        this.prototype[k]=obj[k];
      }
    }
}
var o1={name:"倩倩"} //对象的字面值
var o2={sex:"女"}
var She=function(){}
She.inherits(o1,o2);
var she=new She();
alert(she.name + "," + she.sex);

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!