mounted() {
       Vditor.preview(document.getElementById('vditorPreview'),this.html, {
           className: 'preview vditor-reset vditor-reset--anchor',
           hljs: {
           lineNumber: true,
                    enable: true
           },
           speech: {
                enable: true,
           },
           anchor: true
     })
}

 Cannot read property 'options' of undefined

mounted() {
      this.vditor = new Vditor('vditorEdit', {
          height: 600,
          tab: '\t',
          preview:{
                delay: 200,
          }
      })
}