反应独特的“键”错误

Question

我正在阅读 React 中的待办事项列表教程并遇到以下错误，我花了很长时间却找不到错误..这是错误和组件的代码，这是代码对于课程回购（此提交出现问题）：

https://github.com/andrewjmead/react-course-todo-app/commit/0521f151705f78cb9f8d69262eb093f1431cb9ca

非常感谢任何帮助。

警告：数组或迭代器中的每个子元素都应该有一个唯一的“key”属性。检查 的渲染方法TodoList。有关更多信息，请参阅 fb.me/react-warning-keys。

在 TOGGLE_TODO 的情况下，对于扩展运算符，终端也存在错误

return {
...todo, // here
completed: nextCompleted,
completedAt: nextCompleted ? moment().unix() : undefined
};

var React = require('react');
var { connect } = require('react-redux');
import Todo from 'Todo';
var TodoAPI = require('TodoAPI');

export var TodoList = React.createClass ({
    render: function() {
        var { todos, showCompleted, searchText } = this.props;
        var renderTodos = () => {
            if(todos.length === 0) {
                return (
                    <p className="container__message">No tasks</p>
                );
            }
            return TodoAPI.filterTodos(todos, showCompleted, searchText).map((todo) => {
                return (
                    //add unique key prop to keep track of individual components
                    <Todo key={todo.id} {...todo} />
                );
            });
        };
        return (
            <div>
                {renderTodos()}
            </div>
        );  
    }
});

export default connect(
    (state) => {
        return state;
    }
)(TodoList);

减速机：

var uuid = require('uuid');
var moment = require('moment');

export var searchTextReducer = (state = '', action) => {
    switch (action.type) {
        case 'SET_SEARCH_TEXT':
            return action.searchText;
        default: 
            return state;
    };
};

export var showCompletedReducer = (state = false, action) => {
    switch (action.type) {
        case 'TOGGLE_SHOW_COMPLETED':
            return !state;
        default: 
            return state;
    };    
};

export var todosReducer = (state = [], action) => {
    switch(action.type) {
        case 'ADD_TODO':
            return [
                ...state,
                {
                    text: action.text,
                    id: uuid(),
                    completed: false,
                    createdAt: moment().unix(),
                    completedAt: undefined                   
                }
            ];
        case 'TOGGLE_TODO':
            return state.map((todo) => {
                if(todo.id === action.id) {
                    var nextCompleted = !todo.completed;

                    return {
                        ...todo,
                        completed: nextCompleted,
                        completedAt: nextCompleted ? moment().unix() : undefined
                    };
                } else {
                    return todo;
                }
            });
        case 'ADD_TODOS':
            return [
                ...state,
                ...action.todos
            ];
        default: 
            return state;
    }
};


Webpack:

var webpack = require('webpack');

module.exports = {
  entry: [
    'script!jquery/dist/jquery.min.js',
    'script!foundation-sites/dist/js/foundation.min.js',
    './app/app.jsx'
  ],
  externals: {
      jquery: 'jQuery'
  },
  plugins: [
      new webpack.ProvidePlugin({
          '$': 'jquery',
          'jQuery': 'jquery'
      })
  ],
  output: {
    path: __dirname,
    filename: './public/bundle.js'
  },
  resolve: {
    root: __dirname,
    modulesDirectories: [
        'node_modules',
        './app/components',
        './app/api'
    ],
    alias: {
        applicationStyles: 'app/styles/app.scss',
        actions: 'app/actions/actions.jsx',
        reducers: 'app/reducers/reducers.jsx',
        configureStore: 'app/store/configureStore.jsx'
    },
    extensions: ['', '.js', '.jsx']
  },
  module: {
    loaders: [
      {
        loader: 'babel-loader',
        query: {
          presets: ['react', 'es2015']
        },
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/
      }
    ]
  },
  devtool: 'cheap-module-eval-source-map'
};

Answer 1

node-uuid 已弃用，请在此处查看： https: //www.npmjs.com/package/uuid

您可以通过安装 uuid 来更新 package.json 并查看是否有帮助：

npm 安装 uuid

只是不要忘记更新 var uuid = require('node-uuid'); var uuid = require('uuid'); 在你的其他文件中。

PS 当你运行 webpack 时，你的终端中是否出现任何错误？