CharacterController 不动：按成本从低到高的七项检查

using UnityEngine;

// Attach it to the SAME object as your movement script, press Play, hold W.
public class MoveProbe : MonoBehaviour
{
    CharacterController cc;

    void Awake()
    {
        cc = GetComponent<CharacterController>();
    }

    void Update()
    {
        Vector3 input = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));

        // A green ray out of the character's head, growing as you press.
        // It draws in the Scene view, not the Game view.
        if (input.sqrMagnitude > 0.001f)
            Debug.DrawRay(transform.position + Vector3.up, input * 2f, Color.green);

        // Once a second so the Console does not flood. Clicking a line selects
        // the object that wrote it: trust this output, not your memory.
        if (Time.frameCount % 60 == 0)
            Debug.Log(name + " | input " + input
                      + " | deltaTime " + Time.deltaTime
                      + " | controller " + (cc != null)
                      + " | grounded " + (cc != null && cc.isGrounded), this);
    }
}

using UnityEngine;

[RequireComponent(typeof(CharacterController))]
public class PlayerMove : MonoBehaviour
{
    // A float with no value stays 0 forever, and nothing about that is red.
    // [SerializeField] keeps it visible so you can watch it during Play.
    [SerializeField] private float speed = 6f;
    [SerializeField] private float gravity = -20f;

    CharacterController cc;
    float verticalSpeed;

    void Awake()
    {
        cc = GetComponent<CharacterController>();
        if (cc == null)
            Debug.LogError(name + " has no CharacterController on this object", this);
    }

    void Update()
    {
        Vector3 input = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));
        if (input.sqrMagnitude > 1f) input.Normalize();

        // Local input to world direction, along THIS character's facing.
        // Vector3.forward here would be world north instead.
        Vector3 planar = transform.TransformDirection(input) * speed;

        // A CharacterController ignores physics, so gravity is manual.
        if (cc.isGrounded && verticalSpeed < 0f) verticalSpeed = -2f;
        verticalSpeed += gravity * Time.deltaTime;

        // Move takes metres for THIS frame, so deltaTime is multiplied on.
        // The return value is what stopped you: Sides is a wall, Below the floor.
        CollisionFlags hit = cc.Move((planar + Vector3.up * verticalSpeed) * Time.deltaTime);

        if (input.sqrMagnitude > 0.001f && (hit & CollisionFlags.Sides) != 0)
            Debug.Log(name + " is pressing into something: " + hit, this);
    }
}

// speed = 6, running at 60 fps, so Time.deltaTime is about 0.0166.
cc.Move(input * speed);                   // 6 metres EVERY frame: 360 m/s
cc.Move(input * speed / Time.deltaTime);  // 360 metres per frame: gone by frame 2
cc.Move(input * speed * Time.deltaTime);  // 0.1 m this frame, which is 6 m/s — correct