Redux:如何将项添加到Array,并返回包含所有项的Array

不要改变你的initialState,而是将你.push的最后一个状态"复制"成有意义的新状态

import { ADD_COIN } from './actions'

const initialState = [];

export default (state = initialState, action) => {
    switch(action.type) {
        case ADD_COIN:
            return [...state, action.portfolio]; // same as state.concat(action.portfolio)
        default:
            return state;
    }
}