水印添加方式:1.新建 waterMark.js 内容如下
let watermarkOption = {}
let setWatermarkContent = (content) => {
let id = '1.23452384164.123412415'
if (document.getElementById(id) !== null) {
document.body.removeChild(document.getElementById(id))
}
let ele = document.createElement('canvas')
ele.width = 250
ele.height = 150
let getCanvas = ele.getContext('2d')
getCanvas.rotate(-20 * Math.PI / 180)
getCanvas.font = '20px Vedana'
getCanvas.fillStyle = 'rgba(200, 200, 200, 0.20)'
getCanvas.textAlign = 'center'
getCanvas.textBaseline = 'Middle'
getCanvas.fillText(content, ele.width / 3, ele.height / 2)
let div = document.createElement('div')
div.id = id
div.style.pointerEvents = 'none'
div.style.top = '0px' // 水印距离 上边的距离
div.style.left = '0px' // 水印距离 左边的距离
div.style.position = 'fixed'
div.style.zIndex = '100000'
div.style.width = document.documentElement.clientWidth - 100 + 'px' // 生成水印画布大小的宽度
div.style.height = document.documentElement.clientHeight - 100 + 'px' // 生成水印画布大小的高度
div.style.background = 'url(' + ele.toDataURL('image/png') + ') left top repeat'
document.body.appendChild(div)
return id
}
// 该方法只允许调用一次
watermarkOption.set = (content) => {
let id = setWatermarkContent(content)
setInterval(() => {
if (document.getElementById(id) === null) {
id = setWatermarkContent(content)
}
}, 500)
window.onresize = () => {
setWatermarkContent(content)
}
}
export default watermarkOption
2.在入口app引入
<template>
<div id="app">
<img src="./assets/logo.png">
<router-view/>
</div>
</template>
<script>
import waterMark from './untils/waterMark'
export default {
name: 'App',
data(){
return {
}
},
mounted(){
// 你要的内容
waterMark.set("水印测试")
},
methods:{
}
}
</script>
<style>
</style>