vue点击生成二维码（通过插件来实现）

@click="share"

 <!-- 二维码 -->
    <van-overlay :show="show" @click="show = false">
      <div class="wrapper">
        <div class="block">
          <p>分享</p>
          <div>
            <img :src="imrUrl" />
          </div>
        </div>
      </div>
    </van-overlay>

show: false,
imrUrl: ""

npm install --save qrcode

import QRCode from 'qrcode'  //那使用哪用

// With promises
QRCode.toDataURL('I am a pony!')
  .then(url => {
    console.log(url)
  })
  .catch(err => {
    console.error(err)
  })

 // 点击分享
    share() {
      this.show = true;
      let url = location.href;//获取当前地址栏的地址
      console.log(url);
      QRCode.toDataURL(url)
        .then(tpian => {
          console.log(tpian);
          this.imrUrl = tpian;
        })
        .catch(err => {
          console.error(err);
        });
    },