vue.js实现连接打印机

<p class="dialogCare">
 <span>hello word!</span> //要打印的内容</p>
<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;
 },