详情参考:https://www.npmjs.com/package/watermark-package
示例方法

  <el-button type="primary" @click="AddWatermark">添加水印</el-button><el-button type="primary" @click="RemoveWatermark">清除水印</el-button>

const AddWatermark = () => {watermark.setWaterMark({w_texts: ['娃哈哈', '177****0000'],w_options: {w_width: 240,w_height: 140,w_top: '0px',w_left: '0px',w_rotateDeg: 25,w_font: '1.2rem Vedana',w_color: 'red',w_opacity: '0.2',w_zIndex: '100000'}})
}
const RemoveWatermark = () => {watermark.removeWatermark()
}