W250913/16.Webpack/src/index.js

console.log("你好aaaaaa",document.getElementById("box")); 
import './index.css';
import Pic from './1.jpg';
document.body.insertAdjacentHTML('beforebegin','<h1>你好</h1>')
// document.body.insertAdjacentHTML('beforebegin',`<img src=${Pic}></img>`)