Unity获取鼠标位置，控制物体左右移动

Vector3 screenPosition;//将物体从世界坐标转换为屏幕坐标
Vector3 mousePositionOnScreen;//获取到点击屏幕的屏幕坐标
Vector3 mousePositionInWorld;//将点击屏幕的屏幕坐标转换为世界坐标
void Update()
{
MouseFollow();
}
void MouseFollow()
{
//获取鼠标在相机中（世界中）的位置，转换为屏幕坐标；
screenPosition = Camera.main.WorldToScreenPoint(transform.position);
//获取鼠标在场景中坐标
mousePositionOnScreen = Input.mousePosition;
//让场景中的Z=鼠标坐标的Z
mousePositionOnScreen.z = screenPosition.z;
//将相机中的坐标转化为世界坐标
mousePositionInWorld = Camera.main.ScreenToWorldPoint(mousePositionOnScreen);
//物体跟随鼠标移动
//transform.position = mousePositionInWorld;
//物体跟随鼠标X轴移动
transform.position = new Vector3(mousePositionInWorld.x,transform.position.y,transform.position.z);