找不到模塊「反應」

Question

我在嘗試將React集成到現有網頁中。目前，我無法加載我的React應用程序。我的React應用程序有兩個文件。在這個時候，他們看起來是這樣的：

myApp.js

import React from 'react'; 
import ReactDOM from 'react-dom'; 

import MyComponent from './components/myComponent'; 

ReactDOM.render(<MyComponent />, document.getElementById('root')); 

myComponent.js

import React from 'react'; 
import ReactDOM from 'react-dom'; 

class MyComponent extends React.Component { 
    render() { 
    console.log('here'); 
    return (
     <div> 
     <h2>Hello (from React)</h2> 
     <br />   
     </div> 
    ); 
    } 
} 

export default MyComponent; 

正如你所看到的，我使用ES6。我決定在這個項目上使用ES6。出於這個原因，我在我的Gulp文件中使用Babel來捆綁我的React應用程序。我使用的是Gulp而不是Webpack，因爲我的網站已經在使用Gulp了。不過，在我的package.json文件中的相關細節是這樣的：

的package.json

... 
"devDependencies": { 
    "babel-preset-es2015": "^6.14.0", 
    "babel-preset-react": "^6.11.1", 
    "babelify": "^7.3.0", 
    "browserify": "^13.1.0", 
    "gulp": "^3.9.1", 
    "gulp-babel": "^6.1.2", 
    "gulp-clean-css": "^2.0.11", 
    "gulp-uglify": "^1.5.4", 
    "vinyl-source-stream": "^1.1.0" 
} 

我然後我捆綁使用下列任務陣營應用：

gulpfile.js

gulp.task('buildApp', function() { 
    return browserify({ entries: ['./app/myApp.js', './app/components/myComponent.js'] }) 
     .transform("babelify", {presets: ['es2015', 'react']}) 
     .bundle() 
     .pipe(source('bundle.js')) 
     .pipe(gulp.dest('./app'))   
    ; 
}); 

當上述任務運行時，bundle.js文件獲取產生d。它看起來像這樣：

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){ 
'use strict'; 

var _react = require('react'); 

var _react2 = _interopRequireDefault(_react); 

var _reactDom = require('react-dom'); 

var _reactDom2 = _interopRequireDefault(_reactDom); 

var _myComponent = require('./components/myComponent'); 

var _myComponent2 = _interopRequireDefault(_myComponent); 

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } 

_reactDom2.default.render(_react2.default.createElement(NyComponent, null), document.getElementById('root')); 

},{"./components/myComponent":2,"react":"react","react-dom":"react-dom"}],2:[function(require,module,exports){ 
'use strict'; 

Object.defineProperty(exports, "__esModule", { 
    value: true 
}); 

var _createClass = function() { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); 

var _react = require('react'); 

var _react2 = _interopRequireDefault(_react); 

var _reactDom = require('react-dom'); 

var _reactDom2 = _interopRequireDefault(_reactDom); 

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } 

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } 

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; } 

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } 

var MyComponent = function (_React$Component) { 
    _inherits(MyComponent, _React$Component); 

    function MyComponent() { 
    _classCallCheck(this, MyComponent); 

    return _possibleConstructorReturn(this, (MyComponent.__proto__ || Object.getPrototypeOf(MyComponent)).apply(this, arguments)); 
    } 

    _createClass(MyComponent, [{ 
    key: 'render', 
    value: function render() { 
     console.log('here'); 
     return _react2.default.createElement(
     'div', 
     null, 
     _react2.default.createElement(
      'h2', 
      null, 
      'Hello (from React)' 
     ), 
     _react2.default.createElement('br', null) 
    ); 
    } 
    }]); 

    return MyComponent; 
}(_react2.default.Component); 

exports.default = MyComponent; 

},{"react":"react","react-dom":"react-dom"}]},{},[1]); 

然後，在網頁中，我試圖加載該應用程序之中，我有以下幾點：

... 
<div id="root"></div> 

<script type="text/javascript" src="https://unpkg.com/react@15.3.1/dist/react.js"></script> 
<script type="text/javascript" src="https://unpkg.com/react-dom@15.3.1/dist/react-dom.js"></script> 
<script type="text/javascript" src="/app/bundle.js"></script> 
... 

當我試圖加載在加載此瀏覽器，我的React應用程序不加載。我可以在控制檯窗口中看到以下錯誤消息：

Uncaught Error: Cannot find module 'react' 

我不明白爲什麼反應沒有得到加載。

Answer 1

你的package.json裏沒有React。您的項目很難使用您尚未安裝的軟件包。

只需在您的package.json中添加："react": "^15.3.1"並執行新的npm安裝，您應該沒問題。

Answer 2

在您的本地目錄中執行npm install react。 它爲我工作。