需求是微信端将页面截屏之后保存到本地，使用了html2canvas插件

先引入插件

npm install --save html2canvas

 之后在你所需要使用的页面引入

import html2canvas from "html2canvas"

 先来看html页面

<div ref="imageWrapper">
      <div class="success">
        <div class="img">
          <img class="img-icon" src="../assets/success.png"/>
          <p style="font-weight: 600; font-size: 18px">支付成功</p>
        </div>
      </div>
      <div class="success-detail">
        <el-row style="margin-top: 10px;">
          <el-col :span="5" class="col-left-suc">收款商家</el-col>
          <el-col :span="16" class="col-right">{{merchant}}</el-col>
        </el-row>
        <el-row style="margin-top: 10px;">
          <el-col :span="5" class="col-left-suc">费用名称</el-col>
          <el-col :span="16" class="col-right">{{contName}}</el-col>
        </el-row>
        <el-row style="margin-top: 10px;">
          <el-col :span="5" class="col-left-suc">缴费金额</el-col>
          <el-col :span="16" class="col-right">{{chargePrice}}元</el-col>
        </el-row>
      </div>
    </div>
    <div class="button">
      <el-button style="width: 70%;" type="success" size="small" @click="toImage">生成截图</el-button>
    </div>

vue中用ref来指定你需要截屏的dom

再来看js

toImage() {
        html2canvas(this.$refs.imageWrapper).then(canvas => {
          let dataURL = canvas.toDataURL("image/png");
          this.imgUrl = dataURL;
          if (this.imgUrl !== "") {
            this.dialogTableVisible = true;
          }
        });
      }

效果图