我试图使用javascript对象继承来覆盖" private"基地中的方法" class" (换句话说,使其成为受保护的方法)。
有可能吗?这是我最好的尝试(不起作用)
function Vehicle(color) {
this.color = color;
}
Vehicle.prototype.drive = function() {
_getMessage.call(this);
}
function _getMessage() {
console.log("override this method!")
}
//----------------------------------------------------------------
var Car = (function() {
Car.prototype = Object.create(Vehicle.prototype);
Car.prototype.constructor = Car;
function Car(color) {
Vehicle.call(this, color)
}
function _getMessage() {
console.log("The " + this.color + " car is moving!")
}
return Car;
}());
//----------------------------------------------------------------
$(function() {
var c = new Car('blue');
c.drive()
})
答案 0 :(得分:2)
您可以引入可以更改私有方法的特权方法:
// IIFE to create constructor
var Car = (function(){
// Private method
function _getMessage(text){
console.log('original: ' + text);
}
// Normal constructor stuff
function Car(make){
this.make = make;
}
Car.prototype.getMake = function(){
return this.make;
}
Car.prototype.getMessage = function(){
_getMessage(this.make);
}
// Privileged function to access & change private method
Car.changeGetMessage = function(fn) {
_getMessage = fn;
}
return Car;
}());
// Demonstration
// Create instance
var ford = new Car('Ford');
console.log(ford.getMake());
// Call original method
ford.getMessage();
// Replace original
Car.changeGetMessage(function(text){
console.log('new message: ' + text);
});
// Existing instances get new method
ford.getMessage();
// Create new instance
var volvo = new Car('Volvo');
console.log(volvo.getMake());
// New instances get method too
volvo.getMessage();