我通过下面的 System.config 安装并导入了 react 和 react-dom，但我仍然收到以下错误:
Uncaught (in promise) Error: Unexpected token <(…)
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ES2015 Module Example</title>
</head>
<body>
<script src="lib/system.js"></script>
<script>
System.config({
"baseURL": "src",
// Set defaultJSExtensions to true so you don't have to use .js extension when importing the es6 module.
"defaultJSExtensions": true,
// 'plugin-babel' or 'traceur' or 'typescript'
transpiler: 'traceur',
map: {
'react': './node_modules/react/dist/react.min.js',
'react-dom': './node_modules/react-dom/dist/react-dom.min.js',
'traceur': './lib/traceur.min.js',
'plugin-babel': './lib/plugin-babel/plugin-babel.js',
'systemjs-babel-build': './lib/plugin-babel/systemjs-babel-browser.js'
},
});
System.import("app.js");
</script>
</body>
<div id="example"></div>
</html>
应用程序.js:
import React from 'react';
import ReactDOM from 'react-dom';
var Hello = React.createClass({
render: function() {
return <h1>Hello {this.props.name}</h1>;
}
});
ReactDOM.render(
<Hello name="World" />,
document.getElementById('example')
);
知道我还需要配置什么吗？
最佳答案
browserify 是最好的解决方案(用于生产和开发)- 对我来说:
npm install --save-dev babel-preset-react
一饮而尽:
var gulp = require('gulp');
var browserify = require('browserify');
var babelify = require('babelify');
var source = require('vinyl-source-stream');
var buffer = require('vinyl-buffer');
var uglify = require('gulp-uglify');
var sourcemaps = require('gulp-sourcemaps');
var livereload = require('gulp-livereload');
gulp.task('build', function() {
// app.js is your main JS file with all your module inclusions
return browserify({entries: 'src/app.js', debug: true})
.transform("babelify", { presets: ["es2015", "react"] })
.bundle()
.pipe(source('compile.min.js'))
.pipe(buffer())
.pipe(sourcemaps.init())
.pipe(uglify())
.pipe(sourcemaps.write('./maps'))
.pipe(gulp.dest('js'))
.pipe(livereload());
});
gulp.task('default', ['build']);
至于使用 SystemJS 的非生产环境(非常慢):
<!DOCTYPE html>
<script src="https://jspm.io/system@0.19.js"></script>
<script>
System.config({
transpiler: 'babel',
babelOptions: {}
});
System.import('./main.js');
</script>
您仍然可以使用 gulp 进行开发。只需将其添加到 gulpfile 中:
gulp.task('watch', ['build'], function () {
livereload.listen();
gulp.watch('js/*.js', ['build']);
});
gulp.task('default', ['watch']);
这使您免于其他繁琐的开发工作流程，如 listed在这里。
关于javascript - React ES6 SystemJS - 未捕获( promise )错误 : Unexpected token <(…)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39984743/