javascript - Redux 会多次调度 action，即使它只在一个函数中调度一次

Question

所以，我想直接将优先级的值(最初为1)替换为不同的值。我为它创建了一个 redux 函数，但它多次发送该函数。

行动

export const editPriority = (id, listID, newPriority) => {
  return {
    type: TRELLO_CONSTANTS.PRIORITY,
    payload: { id, listID, newPriority },
  };
};

case TRELLO_CONSTANTS.PRIORITY: {
      const { id, newPriority } = action.payload;
      const card = state[id];
      card.priority = newPriority;
      return { ...state, [`card-${id}`]: card };
    }

export const TRELLO_CONSTANTS = {
  PRIORITY: 'PRIORITY',
};

这是我的函数 -

import {editPriority} from './actionTypes.js';

const card=({dispatch})=> {
  const [newPriority, priority] = useState(); 
}

const changePriority = (e) => {
    // newPriority(e);
    priority(e);
    dispatch(editPriority(id, listID, priority));
    console.log(priority);
  };

// and the main function


 <button onClick={changePriority(1)}>1</button>
<button onClick={changePriority(2)}>0</button>

{priority === 0 ? <p>0</p> : null}
{priority === 1 ? <p>1</p> : null}

优先级 reducer 有问题吗？

Answer 1

您正在 onClick 处理程序中调用changePriority 函数。只需传递函数引用即可

<button onClick={() => changePriority(1)}>1</button>
<button onClick={() => changePriority(2)}>0</button>