// Set to false to disable this control //鼠标控制是否可用	this.enabled = true;// "target" sets the location of focus, where the object orbits around //聚焦坐标	this.target = new THREE.Vector3();// How far you can dolly in and out ( PerspectiveCamera only ) //最大最小相机移动距离(景深相机)	this.minDistance = 0;	this.maxDistance = Infinity; // How far you can zoom in and out ( OrthographicCamera only ) //最大最小鼠标缩放大小（正交相机）	this.minZoom = 0;	this.maxZoom = Infinity;// How far you can orbit vertically, upper and lower limits.// Range is 0 to Math.PI radians. //最大仰视角和俯视角	this.minPolarAngle = 0; // radians	this.maxPolarAngle = Math.PI; // radians// How far you can orbit horizontally, upper and lower limits.// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ]. //水平方向视角限制	this.minAzimuthAngle = - Infinity; // radians	this.maxAzimuthAngle = Infinity; // radians// Set to true to enable damping (inertia)// If damping is enabled, you must call controls.update() in your animation loop //惯性滑动，滑动大小默认0.25	this.enableDamping = false;	this.dampingFactor = 0.25;// This option actually enables dollying in and out; left as "zoom" for backwards compatibility.// Set to false to disable zooming //滚轮是否可控制zoom，zoom速度默认1	this.enableZoom = true;	this.zoomSpeed = 1.0;// Set to false to disable rotating //是否可旋转，旋转速度	this.enableRotate = true;	this.rotateSpeed = 1.0;// Set to false to disable panning //是否可平移，默认移动速度为7px	this.enablePan = true;	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push// Set to true to automatically rotate around the target// If auto-rotate is enabled, you must call controls.update() in your animation loop //是否自动旋转，自动旋转速度。默认每秒30圈	this.autoRotate = false;	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60// Set to false to disable use of the keys //是否能使用键盘	this.enableKeys = true;// The four arrow keys //默认键盘控制上下左右的键	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };// Mouse buttons //鼠标点击按钮	this.mouseButtons = { ORBIT: THREE.MOUSE.LEFT, ZOOM: THREE.MOUSE.MIDDLE, PAN: THREE.MOUSE.RIGHT };