Vuex状态的长度不出来

Question

There is a state in the vuex.

I defined 'images' as an array and when I print by console.log(state.images), the result came out like below.

[__ob__: Observer]
0: {…}
1: {…}
2: {…}
3: {…}
4: {…}
length: 5
__ob__: Observer {value: Array(5), dep: Dep, vmCount: 0}
__proto__: Array

After that, when I use console.log(state.images[0]) or console.log(state.images.length) doesn't work. Could you recommend some solution? Thank you so much for reading this.

EDIT) I write more code in detail.

const state = {
    images:[]
};

const mutations = {
    pushPresentImage(state, yo) {
        state.images.push(yo);
},

const actions = {
    imageLoad() {

    },

    imageLength({commit}, image){
        axios.post('/', ...)
           .then(result =>{ 
                commit('pushPresentImage', result.data.image)
            })
           .then(() => {
                console.log(state.images) // it works well like above.
                console.log(state.images[0]) // it says undefined.. 
            })
},

Answer 1

Seems like you are reading the state.images[0] array when the state is not fully saved by vuex. But I tried with the same code you used and it worked for me. Try restructuring your state so it does not stand alone:

import Vue from "vue";
import Vuex from "vuex";
import axios from "axios";

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    todos: []
  },
  mutations: {
    pushPresentImage(state, yo) {
      state.todos.push(yo);
    }
  },
  actions: {
    imageLoad() {},
    imageLength({ commit, rootState }, image) {
      axios
        .get("https://jsonplaceholder.typicode.com/todos/1")
        .then(result => {
          commit("pushPresentImage", result.data);
        })
        .then(() => {
          console.log(rootState.todos); // it works well like above.
          console.log(rootState.todos[0]); // it does not say undefined..
        });
    }
  }
});

export default store;

Here is the sample code on codesandbox