Js custom plug-in encapsulation

what is the difference between the following two prototypes of inherited development when learning about plug-in encapsulation?

function Dialog () {}

Dialog.prototype.fun1 = function () {
console.log ("fun1");
}

Dialog.prototype.fun2 = function () {
console.log ("fun2");
}

< hr >

Dialog.prototype = {

constructor: this,
fun1:function () {

console.log("fun1");

},
fun2:function () {

console.log("fun2");

}
}

what result do you expect? What is the error message actually seen?

Javascript
Nov.14,2021

the first is to add something to the existing chain, and the second is to point to another chain
in addition, your this what the hell is

has the same effect, but the second part will rewrite the prototype chain. If you don't point constructor back to the current one, then constructor points to object, not the function you defined.

Is that the question you want to ask

?
when implementing inheritance through a prototype chain, you cannot use object literals to create a prototype method, as this will override the prototype chain 

function SuperType() {
    this.property = true;
}

SuperType.prototype.getSuperValue = function () {
    return this.property;
}

function SubType() {
    this.subproperty = false;
}

//SuperType 
SubType.prototype = new SuperType();

// 
SubType.prototype = {
    getSubValue: function () {
        return this.subproperty;
    },
    someOtherMethod: function () {
        return false;
    }

}
var instance = new SubType();
alert(instance.getSuperValue()); //error

Previous: The problem of using mongodb in golang gin

Next: The vue props is passed to the subcomponent and does not get a value.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu