Function start

examples/core-demos/src/demos/DemoBase.ts:41–51

()

    }

    public start() {
        if (this.isRunning) return;
        this.isRunning = true;
        this.lastTime = performance.now();

        // 设置当前场景到Core
        Core.setScene(this.scene);

        this.scene.begin();
        this.loop();
    }

    public stop() {
        this.isRunning = false;