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vue签名板实现

2026-02-20 09:00:12VUE

实现 Vue 签名板的方法

使用 HTML5 Canvas 和 Vue 结合

在 Vue 中实现签名板可以通过 HTML5 的 Canvas 元素结合 Vue 的事件绑定和数据管理来完成。以下是一个基本的实现步骤。

安装依赖（可选）

如果需要更复杂的签名功能，可以安装专门的 Vue 签名库，例如 vue-signature-pad：

npm install vue-signature-pad

基础实现代码

以下是一个不依赖第三方库的基础实现示例：

<template>
  <div>
    <canvas 
      ref="canvas"
      @mousedown="startDrawing"
      @mousemove="draw"
      @mouseup="stopDrawing"
      @mouseleave="stopDrawing"
      @touchstart="handleTouchStart"
      @touchmove="handleTouchMove"
      @touchend="handleTouchEnd"
    ></canvas>
    <button @click="clearCanvas">清除</button>
    <button @click="saveSignature">保存</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isDrawing: false,
      canvas: null,
      ctx: null,
    };
  },
  mounted() {
    this.canvas = this.$refs.canvas;
    this.ctx = this.canvas.getContext('2d');
    this.setCanvasSize();
    window.addEventListener('resize', this.setCanvasSize);
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.setCanvasSize);
  },
  methods: {
    setCanvasSize() {
      this.canvas.width = this.canvas.offsetWidth;
      this.canvas.height = this.canvas.offsetHeight;
    },
    startDrawing(e) {
      this.isDrawing = true;
      this.draw(e);
    },
    draw(e) {
      if (!this.isDrawing) return;
      this.ctx.lineWidth = 2;
      this.ctx.lineCap = 'round';
      this.ctx.strokeStyle = '#000';

      const rect = this.canvas.getBoundingClientRect();
      const x = e.clientX - rect.left;
      const y = e.clientY - rect.top;

      this.ctx.lineTo(x, y);
      this.ctx.stroke();
      this.ctx.beginPath();
      this.ctx.moveTo(x, y);
    },
    stopDrawing() {
      this.isDrawing = false;
      this.ctx.beginPath();
    },
    clearCanvas() {
      this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
    },
    saveSignature() {
      const dataUrl = this.canvas.toDataURL('image/png');
      console.log(dataUrl); // 可以保存或上传到服务器
    },
    handleTouchStart(e) {
      e.preventDefault();
      const touch = e.touches[0];
      const mouseEvent = new MouseEvent('mousedown', {
        clientX: touch.clientX,
        clientY: touch.clientY
      });
      this.startDrawing(mouseEvent);
    },
    handleTouchMove(e) {
      e.preventDefault();
      const touch = e.touches[0];
      const mouseEvent = new MouseEvent('mousemove', {
        clientX: touch.clientX,
        clientY: touch.clientY
      });
      this.draw(mouseEvent);
    },
    handleTouchEnd(e) {
      e.preventDefault();
      const mouseEvent = new MouseEvent('mouseup', {});
      this.stopDrawing(mouseEvent);
    }
  }
};
</script>

<style>
canvas {
  border: 1px solid #000;
  width: 100%;
  height: 300px;
  background-color: #fff;
}
</style>

使用第三方库（vue-signature-pad）

如果需要更完整的签名功能（如压力敏感度、平滑曲线等），可以使用 vue-signature-pad 库：

<template>
  <div>
    <VueSignaturePad 
      ref="signaturePad" 
      width="100%" 
      height="300px" 
      :options="{ penColor: '#000' }"
    />
    <button @click="clearSignature">清除</button>
    <button @click="saveSignature">保存</button>
  </div>
</template>

<script>
import VueSignaturePad from 'vue-signature-pad';

export default {
  components: {
    VueSignaturePad
  },
  methods: {
    clearSignature() {
      this.$refs.signaturePad.clearSignature();
    },
    saveSignature() {
      const { dataUrl } = this.$refs.signaturePad.saveSignature();
      console.log(dataUrl); // 可以保存或上传到服务器
    }
  }
};
</script>