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    private NavMeshAgent agent;

    void Start()
    {
        //获取角色上的NavMeshAgent组件
        agent = GetComponent<NavMeshAgent>();
    }
    void Update()
    {
        //鼠标左键
        if (Input.GetMouseButtonDown(0))
        {
            //射线检测
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            bool isCollider = Physics.Raycast(ray, out hit);
            if (isCollider)
            {
                //hit.point射线触碰的Position
                //SetDestination设置下一步的位置
                agent.SetDestination(hit.point);
            }
        }
}