vue3+ts使用插件vue3-esign完成签字、重签（h5、vant）

1.安装vue3-esign：npm i vue3-esign

2.main.ts中引入：

<van-nav-bar title="手写签字" left-arrow fixed />
    <div id="sign_box">
      <div class="text">
        请在空白区域横向书写
      </div>
      <div class="canvaspanel">
        <div class="canvasborder">
          <Vue3Esign
            ref="vueEsignRef" :width="clientWidth" :height="clientHeight" :is-crop="isCrop" :line-width="lineWidth" :line-color="lineColor"
          />
        </div>
        <div class="buttongroup">
          <van-button color="#d4e8ff" style="color: #000;width: 100px;" @click="esignReset">
            重写
          </van-button>
          <van-button color="linear-gradient(to right, #2E9BEF, #0168B7)" style="margin-left: 10px;width: 100px;" @click="create">
            确认
          </van-button>
        </div>
      </div>
    </div>

<script setup lang="ts">
const vueEsignRef = ref<any>(null)
const lineWidth = ref(5)
const lineColor = ref('#000000')
const isCrop = ref<boolean>(true)
const hasSign = ref<boolean>(false)
const clientWidth = ref<number>(400)
const clientHeight = ref<number>(700)

const esignReset = async () => {
  vueEsignRef.value.reset()
}
const create = async () => {
  try {
    const res = await vueEsignRef.value.generate()
    // const bl = convertBase64UrlToBlob(res)
    addByBaseCode({ // 此处用了项目中一个接口向后端传了base64的图片
      imgStr: res,
    }).then((response) => {
      hasSign.value = true
    })
  }
  catch (error) {
    console.error('error', error)
    showToast('请先签字')
  }
}
</script>

<style lang="less" scoped>
#sign_box{
  //横向操作
  .nav-bar.van-nav-bar__placeholder{
    width: 100%;
    height: 46px !important;
    transform: rotate(90deg);
    position: fixed;
    top: 0;
    right: -100%;
    transform-origin: 0% 0%;
    z-index: 10;
  }
}
.canvasborder {
  border: solid 1px #ccc;
}
.canvaspanel {
  position: relative;
}
.text {
    color: #919191;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: rotate(90deg);
    z-index: 10;
    right: -16vw;
    position: fixed;
    top: 32vw;
}

.buttongroup {
    display: flex;
    justify-content: center;
    align-items: center;
    transform: rotate(90deg);
    z-index: 10;
    left: -16vw;
    position: fixed;
    bottom: 100px;
}
</style>

效果：