demo/render.js

import Vditor from '../src/method'
import '../src/assets/less/index.less'

const outlineElement = document.getElementById('outline')
const previewElement = document.getElementById('preview')

document.querySelector('.markdown-list').addEventListener('click', function (event) {
    if (event.target.tagName === 'SPAN') {
        render(event.target.getAttribute('data-file'))
    }
})

previewElement.addEventListener('click', function (event) {
    if (event.target.tagName === 'IMG') {
        Vditor.previewImage(event.target, 'zh_CN', outlineElement.classList.contains('dark') ? 'dark' : 'classic')
    }
})

const render = (fileName) => {
    fetch(`/demo/markdown/${fileName}.md`).then(response => response.text()).then(markdown => {

        Vditor.preview(previewElement, markdown, {
            cdn: '',
            markdown: {
                toc: true, listStyle: fileName === 'cute-list',
            },
            speech: {
                enable: true,
            },
            anchor: 1, after() {
                if (window.innerWidth <= 768) {
                    return
                }
                Vditor.outlineRender(previewElement, outlineElement)
                if (outlineElement.innerText.trim() !== '') {
                    outlineElement.style.display = 'block'
                }
            },
            lazyLoadImage: 'https://cdn.jsdelivr.net/npm/vditor/dist/images/img-loading.svg',
            renderers: {
                renderHeading: (node, entering) => {
                    const id = Lute.GetHeadingID(node)
                    if (entering) {
                        return [`<h${node.__internal_object__.HeadingLevel} id="${id}" class="vditor__heading"><span class="prefix"></span><span>`, Lute.WalkContinue]
                    } else {
                        return [`</span><a id="vditorAnchor-${id}" class="vditor-anchor" href="#${id}"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a></h${node.__internal_object__.HeadingLevel}>`, Lute.WalkContinue]
                    }
                },
            },
        })
    })
}

render('zh_CN')
window.setTheme = (theme) => {
    if (theme === 'dark') {
        Vditor.setCodeTheme('native')
        Vditor.setContentTheme('dark', 'https://cdn.jsdelivr.net/npm/vditor/dist/css/content-theme')
        outlineElement.classList.add('dark')
        document.querySelector('html').style.backgroundColor = '#2f363d'
    } else {
        Vditor.setCodeTheme('github')
        Vditor.setContentTheme('light', 'https://cdn.jsdelivr.net/npm/vditor/dist/css/content-theme')
        outlineElement.classList.remove('dark')
        document.querySelector('html').style.backgroundColor = '#fff'
    }
}