您的代码正在尝试在一个函数上存根
Sensor，但是您已在上定义了该函数
Sensor.prototype。
sinon.stub(Sensor, "sample_pressure", function() {return 0})基本上与此相同：
Sensor["sample_pressure"] = function() {return 0};但是足够聪明地看到它
Sensor["sample_pressure"]不存在。
因此，您想要做的是这样的事情：
// Stub the prototype's function so that there is a spy on any new instance// of Sensor that is created. Kind of overkill.sinon.stub(Sensor.prototype, "sample_pressure").returns(0);var sensor = new Sensor();console.log(sensor.sample_pressure());
要么
// Stub the function on a single instance of 'Sensor'.var sensor = new Sensor();sinon.stub(sensor, "sample_pressure").returns(0);console.log(sensor.sample_pressure());
要么
// Create a whole fake instance of 'Sensor' with none of the class's logic.var sensor = sinon.createStubInstance(Sensor);console.log(sensor.sample_pressure());
