Javascript 为什么不能';我的吞咽不管用吗
这是我的Javascript 为什么不能';我的吞咽不管用吗,javascript,node.js,reactjs,Javascript,Node.js,Reactjs,这是我的gulpfiles.js: let gulp = require('gulp'); let uglify = require('gulp-uglify'); let browserify = require('browserify'); let babelify = require('babelify'); let source = require('vinyl-source-stream'); let buffer = require('vinyl-buffer'); gu
gulpfiles.js
:
let gulp = require('gulp');
let uglify = require('gulp-uglify');
let browserify = require('browserify');
let babelify = require('babelify');
let source = require('vinyl-source-stream');
let buffer = require('vinyl-buffer');
gulp.task('js',()=>{
browserify({
entries : ['App/app.js'],
extensive : ['.js'],
debug:true
})
.transform(babelify,babelify.configure())
.bundle()
.pipe(source('app.js'))
.pipe(buffer())
.pipe(uglify())
.pipe(gulp.dest('build'))
});
gulp.task('default',['js']);
import React from 'react'
import ReactDom from 'react-dom'
class Helloworld extends React.Purecomponent{
render(){
return(
<h1> Good morning </h1>
);
}
}
ReactDom.render(
<Helloworld />,
document.getElementById('app')
);
这是我的.babelrc
:
{
"presets": ["es2015","react","stage-1"]
}
这是我的index.html
:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="fonts.css" />
<link rel="shortcut icon" href="favicon.ico">
<title>Weather-App</title>
</head>
<body>
<div id="app"></div>
</body>
<script src="build/app.js"></script>
</html>
我不知道为什么当我启动浏览器时,它什么也不显示。打包过程中不会显示错误。要查看browserify错误,您需要订阅
错误事件。尝试以下方法:
gulp.task('js',()=>{
browserify({
entries : ['App/app.js'],
extensive : ['.js'],
debug:true
})
.transform(babelify,babelify.configure())
.bundle()
.on('error', function (err) {
console.log(err.message);
this.emit('end');
})
.pipe(source('app.js'))
.pipe(buffer())
.pipe(uglify())
.pipe(gulp.dest('build'))
});
gulp.task('default',['js']);
特别针对您的情况,您的组件存在一些错误。它应该是PureComponent
而不是PureComponent
和ReactDOM
而不是ReactDOM
:
class Helloworld extends React.PureComponent{
render(){
return(
<h1> Good morning </h1>
);
}
}
ReactDOM.render(
<Helloworld />,
document.getElementById('container')
);
类Helloworld扩展了React.PureComponent{
render(){
返回(
早上好
);
}
}
ReactDOM.render(
,
document.getElementById('容器')
);
当我将React.Purecomponent更改为React.Component时,它会工作
从“React”导入React
从“react dom”导入react dom
类Helloworld扩展了React.Component{
render(){
返回(
早上好
);
}
}
ReactDom.render(
,
document.getElementById('app')
);代码>非常感谢,我使用PureComponent而不是PureComponent,而且workded@answerhua没问题。正如我提到的,我鼓励您订阅错误事件。这将使开发更加容易:)