数组推送在 React 应用程序中无法按预期工作

Question

在我的 React 应用程序中，我使用 MobX 进行状态 management.After 处理 ajax 我试图 push 存储的响应。但事实证明它没有按预期工作。这里的代码：

export class Diary {
    @observable loaded = false;
    @observable posts = [];

    @action getPosts() {
        axios({
            method: 'get',
            url: '/api/diary/',
            headers: {'Authorization': "JWT " + sessionStorage.getItem('token')}
        }).then(action('response action', (response) => {
            (response.data).map(function (post) {
                let hiren = [];
                hiren['id'] = post['id'];
                hiren['title'] = Crypt.decrypt(post['title'], key, post['iv']);
                hiren['content'] = Crypt.decrypt(post['content'], key, post['iv']);
                hiren['tag'] = post['tag'];
                hiren['date'] = moment.utc(post['date']).local().format("dddd, DD MMMM YYYY hh:mm:ss A");

                this.posts.push.apply(this.posts, hiren);
                console.log(toJS(this.posts)); // empty array so the push is not working
            }.bind(this));
            this.loaded = true;
        })).catch(function(err) {
            console.error(err);
        });
    }
}

Answer 1

根据您当前的代码。
1. map不理想，用一个forEach遍历elements
2、关联数组是对象{}，不是数组[]。因此 hiren = {};
3. 要压入数组，只需直接对数组调用this.posts.push(hiren);。

export class Diary {
    @observable loaded = false;
    @observable posts = [];

    @action getPosts() {
        axios({
            method: 'get',
            url: '/api/diary/',
            headers: {'Authorization': "JWT " + sessionStorage.getItem('token')}
        }).then(action('response action', (response) => {

            (response.data).forEach(function (post) {
                /* Associative array is an OBJECT, NOT AN ARRAY ... */
                var hiren = {};
                hiren['id'] = post['id'];
                hiren['title'] = Crypt.decrypt(post['title'], key, post['iv']);
                hiren['content'] = Crypt.decrypt(post['content'], key, post['iv']);
                hiren['tag'] = post['tag'];
                hiren['date'] = moment.utc(post['date']).local().format("dddd, DD MMMM YYYY hh:mm:ss A");

                this.posts.push(hiren);
                console.log(toJS(this.posts)); // empty array so the push is not working
            });

            this.loaded = true;
        })).catch(function(err) {

            console.error(err);
        });
    }
}

数组推送在 React 应用程序中无法按预期工作

Array push not working as expected in react app

javascript

reactjs

mobx-react