alVal = parseFloat(value).toFixed(5)
                    return realVal
                }
            },
            // 1.2 资源销毁
            beforeDestroy() {
                // vue程序销毁时，需要清理相关资源
                this._earth = this._earth && this._earth.destroy();
                this._disposers.forEach(d => d());
                this._disposers.length = 0;
            },
            watch: {
                fovH() {
                    console.log(this.fovH)
             