vue 实现签名框手写签名的功能
时间: 2023-08-27 12:05:17 浏览: 178
好的,关于vue实现签名框手写签名的功能,可以使用HTML5的canvas标签实现。具体可以参考以下步骤:
1. 在vue组件中引入canvas标签,并设置该标签的宽高和边框等样式。如下:
```
<canvas id="canvas" width="400" height="200" style="border:1px solid #000000;"></canvas>
```
2. 在vue组件的mounted生命周期中获取canvas对象,并设置canvas的绘制样式。如下:
```
mounted() {
this.canvas = document.getElementById('canvas');
this.ctx = this.canvas.getContext('2d');
this.ctx.lineWidth = 2; // 设置笔画宽度
this.ctx.strokeStyle = '#000000'; // 设置笔画颜色
}
```
3. 在提供签名功能的按钮事件中,绑定canvas的鼠标事件。如下:
```
<button @click="startDrawing">签名</button>
```
startDrawing方法中绑定事件:
```
startDrawing() {
this.drawing = true;
this.canvas.addEventListener('mousedown', this.onMouseDown);
this.canvas.addEventListener('mouseup', this.onMouseUp);
this.canvas.addEventListener('mousemove', this.onMouseMove);
}
```
4. 监听canvas的鼠标事件,实现手写签名。如下:
```
onMouseDown(e) {
this.ctx.beginPath();
this.ctx.moveTo(e.offsetX, e.offsetY);
this.mouseMoved = false;
}
onMouseMove(e) {
if (this.drawing) {
this.mouseMoved = true;
this.ctx.lineTo(e.offsetX, e.offsetY);
this.ctx.stroke();
}
}
onMouseUp(e) {
if (!this.mouseMoved) {
this.ctx.fillRect(e.offsetX - 1, e.offsetY - 1, 2, 2);
}
this.drawing = false;
this.canvas.removeEventListener('mousedown', this.onMouseDown);
this.canvas.removeEventListener('mouseup', this.onMouseUp);
this.canvas.removeEventListener('mousemove', this.onMouseMove);
}
```
以上就是通过canvas实现vue签名框手写签名的功能的具体步骤。希望能对您有所帮助。
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