微信右上角从浏览器打开

<div class="weixintan" @click="wx_hide">
      <div class="pic"></div>
    </div>

// js
.weixintan {
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .85);
    display: none;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 9999;
  }


  .weixintan .pic {
    width: 100%;
    height: 100%;
    background: url(../../assets/img/wx_tan.png) no-repeat;
    background-size: 100%;
  }