1.新建一个js

js的代码

let watermark = {}let setWatermark = (str) => {let id = '1.23452384164.123412415'if (document.getElementById(id) !== null) {document.body.removeChild(document.getElementById(id))}let can = document.createElement('canvas')can.width = 500can.height = 250let cans = can.getContext('2d')cans.rotate(-20 * Math.PI / 180)cans.font = '14px Microsoft JhengHei'cans.fillStyle = '#dddddd'cans.textAlign = 'left'cans.textBaseline = 'Middle'cans.fillText(str, can.width / 3, can.height / 2)let div = document.createElement('div')div.id = iddiv.style.pointerEvents = 'none'div.style.top = '70px'div.style.left = '0px'div.style.position = 'fixed'div.style.zIndex = '100000'div.style.width = document.documentElement.clientWidth - 100 + 'px'div.style.height = document.documentElement.clientHeight - 100 + 'px'div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'document.body.appendChild(div)return id
}// 该方法只允许调用一次
watermark.set = (str) => {let id = setWatermark(str)setInterval(() => {if (document.getElementById(id) === null) {id = setWatermark(str)}}, 500)window.onresize = () => {setWatermark(str)}
}export default watermark

2.在需要的页面引入

import watermark from '../../util/watermark'
watermark.set('abcd'); //abcd可替换成你自己需要的内容