vue.js如何连接打印机

<div class="dialogCare">
        <span>hello word!</span>   //要打印的内容
</div>

<button  @click="printBtn()">打 印</button>


 printBtn(){
      let newstr = document.getElementsByClassName('dialogCare')[0].innerHTML;
      console.log(newstr)
      window.document.body.innerHTML = newstr;
      let oldstr = window.document.body.innerHTML;
      window.print();
      window.location.reload();   //解决打印之后按钮失效的问题
      window.document.body.innerHTML = oldstr;
      return false;
    },