npm install --save smooth-signature

import SmoothSignature from "smooth-signature";

<template>
  <div class="sign-finish">
    <div class="wrap1" v-show="showFull">
      <span class="sign-title">請(qǐng)?jiān)趨^(qū)域內(nèi)簽字</span>
      <canvas class="canvas1" ref="canvas1" />
      <div class="actions">
          <button class="danger" @click="handleClear1" >清除</button>
          <button class="warning" @click="handleUndo1" >撤銷(xiāo)</button>
          <button class="primary" @click="handleFull" >橫屏</button>
          <button class="success" @click="handlePreview1" >保存</button>
      </div>
    </div>
    <div class="wrap2" v-show="!showFull">
      <div class="actionsWrap">
        <div class="actions">
          <button class="danger" @click="handleClear1" >清除</button>
          <button class="warning" @click="handleUndo1" >撤銷(xiāo)</button>
          <button class="primary" @click="handleFull" >豎屏</button>
          <button class="success" @click="handlePreview1" >保存</button>
        </div>
      </div>
      <canvas class="canvas" ref="canvas2" />
    </div>
  </div>
</template>

<script>
import SmoothSignature from "smooth-signature";
export default {
  name: "mbDemo",
  data() {
    return {
      showFull: true,
    };
  },
  mounted() {
    this.initSignature1();
    this.initSignture2();
  },
  methods: {
    initSignature1() {
      const canvas = this.$refs["canvas1"];
      const options = {
        width: window.innerWidth - 30,
        height: 200,
        minWidth: 2,
        maxWidth: 6,
        openSmooth:true,
        // color: "#1890ff",
        bgColor: '#f6f6f6',
      };
      this.signature1 = new SmoothSignature(canvas, options);
    },
    initSignture2() {
      const canvas = this.$refs["canvas2"];
      const options = {
        width: window.innerWidth - 120,
        height: window.innerHeight - 80,
        minWidth: 3,
        maxWidth: 10,
        openSmooth:true,
        // color: "#1890ff",
        bgColor: '#f6f6f6',
      };
      this.signature2 = new SmoothSignature(canvas, options);
    },
    handleClear1() {
      this.signature1.clear();
    },
    handleClear2() {
      this.signature2.clear();
    },
    handleUndo1() {
      this.signature1.undo();
    },
    handleUndo2() {
      this.signature2.undo();
    },
    handleFull() {
      this.showFull = !this.showFull;
    },
    handlePreview1() {
      const isEmpty = this.signature1.isEmpty();
      if (isEmpty) {
        alert("isEmpty");
        return;
      }
      const pngUrl = this.signature1.getPNG();
      console.log(pngUrl);
      // window.previewImage(pngUrl);
    },
    handlePreview2() {
      const isEmpty = this.signature2.isEmpty();
      if (isEmpty) {
        alert("isEmpty");
        return;
      }
      const canvas = this.signature2.getRotateCanvas(-90);
      const pngUrl = canvas.toDataURL();
      console.log('pngUrl',pngUrl);
      // window.previewImage(pngUrl, 90);
    },
  },
};
</script>

<style lang="less">
.sign-finish {
  height: 100vh;
  width: 100vw;
  button {
    height: 32px;
    padding: 0 8px;
    font-size: 12px;
    border-radius: 2px;
  }
  .danger {
    color: #fff;
    background: #ee0a24;
    border: 1px solid #ee0a24;
  }
  .warning {
    color: #fff;
    background: #ff976a;
    border: 1px solid #ff976a;
  }
  .primary {
    color: #fff;
    background: #1989fa;
    border: 1px solid #1989fa;
  }
  .success {
    color: #fff;
    background: #07c160;
    border: 1px solid #07c160;
  }
  canvas {
    border-radius: 10px;
    border: 2px dashed #ccc;
    
  }
  .wrap1 {
    height: 100%;
    width: 96%;
    margin: auto;
    margin-top: 100px;
    .actions {
      display: flex;
      justify-content: space-around;
    }
  }
  .wrap2 {
    padding: 15px;
    height: 100%;
    display: flex;
    justify-content: center;
    .actionsWrap {
      width: 50px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .canvas {
      flex: 1;
    }
    .actions {
      margin-right: 10px;
      white-space: nowrap;
      transform: rotate(90deg);
      button{
          margin-right: 20px;
      }
    }
  }
}
</style>