小编nek*_*894的帖子

https://www.youtube.com/watch?v=Fa4cRMaTDUI 我正在观看本课并尝试重新创作作者所做的一切.19:00他设置了vue.js-express.js项目.他创建了名为"server"的文件夹.在'server /'中,他运行'npm init -f'.然后'npm install --save nodemon eslint',然后他就进入了eslint.然后在package.json文件中,他写道:

"scripts": {
    "start": "nodemon src/app.js --exec 'npm run lint && node'",
    "lint": "eslint **/*.js"
}

然后在'server'文件夹中创建文件夹'src'.在'src'中他创建'app.js'.并在'app.js; 有一个简单的console.log('你好').然后他跑'npm start'.'Hello'打印在终端,nodemon和eslint工作得很好.然后他输入'npm install --save express'.那是我的问题开始的地方.安装express.js后我输入'npm start',我在终端中收到此错误:

Oops! Something went wrong! :(

ESLint: 5.0.0.
No files matching the pattern "node_modules/ipaddr.js" were found.
Please check for typing mistakes in the pattern.

npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! server@1.0.0 lint: `eslint **/*.js`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the …

使用了两个::before具有不同border属性的伪元素(请参阅js小提琴).尽管"你只能使用一个::before和一个::after伪元素"这实际上是有效的.为什么？

https://jsfiddle.net/8L7zou3e/1/

<div class="el"></div>

.el {
    position: relative;
    margin: 100px 0 0 500px;
    width: 300px;
    height: 100px;
    background-color: #AA4343;
}
.el:before {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-top: 50px solid #e86d0a;
    border-left: 50px solid transparent;
    position: absolute;
    top: 0;
    left: -50px;
}

.el:before {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-bottom: 50px solid #e86d0a;
    border-left: 50px solid transparent;
    position: absolute;
    top: 0px;
    left: -50px;
}