调用特权函数的父实现(calling parent implementations of privileged functions)

 我有两个JavaScript类1之间的继承关系 
 
RealTimeChart = function(chartAttributes) {

    var chart = new FusionCharts(chartAttributes);

    this.appendData = function(data) {
        chart.feedData(data);
    }
};

RealTimeGauge = function(chartAttributes) {
    chartAttributes.type = 'AngularGauge';

    // call parent constructor
    RealTimeChart.call(this, chartAttributes);
};

// inherit from RealTimeChart
RealTimeGauge.prototype = Object.create(RealTimeChart.prototype);
 
 在RealTimeGauge我想覆盖appendData() 。 在RealTimeGauge执行此函数需要调用父实现，这可能吗？ 
 
 如果我将appendData更改为原型函数，则执行此操作相对简单，例如 
 
// parent class
RealTimeChart.prototype.appendData = function(data) {
    this.chart.feedData(data);
};

// child class
RealTimeGauge.prototype.appendData = function(data) {

    console.log("doing custom stuff...");

    // call the parent function to add the data to the chart
    RealTimeChart.prototype.appendData.call(this, data);
};
 
 但是，如果我使appendData成为原型函数而不是特权函数，我还必须将chart设为公共属性，我宁愿不这样做。 如果它是特权函数，是否可以调用appendData表单RealTimeGauge的父实现？ 
 
 
 
 我知道他们不是真正的课程，但我不知道他们有更好的名字 
 

I have an inheritance relationship between two JavaScript classes1
 
RealTimeChart = function(chartAttributes) {

    var chart = new FusionCharts(chartAttributes);

    this.appendData = function(data) {
        chart.feedData(data);
    }
};

RealTimeGauge = function(chartAttributes) {
    chartAttributes.type = 'AngularGauge';

    // call parent constructor
    RealTimeChart.call(this, chartAttributes);
};

// inherit from RealTimeChart
RealTimeGauge.prototype = Object.create(RealTimeChart.prototype);
 
In RealTimeGauge I would like to override appendData(). The implementation of this function in RealTimeGauge needs to call the parent implementation, is this possible?
 
It's relatively straightforward to do this if I change appendData to a prototype function, e.g.
 
// parent class
RealTimeChart.prototype.appendData = function(data) {
    this.chart.feedData(data);
};

// child class
RealTimeGauge.prototype.appendData = function(data) {

    console.log("doing custom stuff...");

    // call the parent function to add the data to the chart
    RealTimeChart.prototype.appendData.call(this, data);
};
 
However, if I make appendData a prototype function rather than a privileged function, I also have to make chart a public property, which I'd rather not do. Is it possible to call the parent implementation of appendData form RealTimeGauge if it's a privileged function?
 
 
 
I know they're not really classes, but I don't know of a better name for them
 

原文：https://stackoverflow.com/questions/25384213