function DetectorBase(){

throw new Error('Abstract class can not be invoked directly!');

}

DetectorBase.prototype.detect=function(){

console.log('Detection starting');

}

DetectorBase.prototype.stop=function(){

console.log('Detector stopped.');

}

DetectorBase.prototype.init=function(){

throw new Error('Error');

}

function LinkDetector(){

}

LinkDetector.prototype=Object.create(DetectorBase.prototype);

LinkDetector.prototype.constructor=LinkDetector;

var link=new LinkDetector();

/**重写init*/

link.init=function(){

console.log(this);

}

link.detect();

link.stop();

link.init();

我是这样理解的，不知道对不对。你参考参考。