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let strArr=[]
let setting = () => {
let id = '1.23452384164.123412415'
// 判断是否之前有添加过，此次添加先删除原有的
if (document.getElementById(id) !== null) {
document.body.removeChild(document.getElementById(id))
}
// 创建canvas标签
let can = document.createElement('canvas')
can.width = 270
can.height = 150
let cans = can.getContext('2d')
cans.rotate(-20 * Math.PI / 180)
cans.font = '20px Vedana'
cans.fillStyle = '#666666'
cans.textAlign = 'center'
cans.textBaseline = 'Middle'
strArr.forEach((item,index)=>{
cans.fillText(item, can.width / 2, can.height + index*30)
})
let div = document.createElement('div')
div.id = id
div.style.pointerEvents = 'none' //删除鼠标事件 实现穿透
div.style.top = '20px'
div.style.left = '0px'
div.style.opacity = '0.15'
div.style.position = 'fixed'
div.style.zIndex = '100000'
div.style.width = window.screen.width + 'px'
div.style.height = window.screen.height + 'px'
div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'
document.body.appendChild(div)
return id
}
// 添加监听属性变化
const observer = new MutationObserver(function(){
setWaterMark()
})
// 添加水印
export const setWaterMark = (Arr) => {
if(Arr?.length){
strArr=Arr
}
let id = setting()
if (document.getElementById(id) === null) {
id = setting()
}
const targetNode=document.getElementById(id)
const config ={
childList: true,
attributes: true,
subtree: true,}
observer.observe(targetNode,config)
}
// 移除水印
export const removeWatermark = () => {
let id = '1.23452384164.123412415'
if (document.getElementById(id) !== null) {
document.body.removeChild(document.getElementById(id))
observer.disconnect()
}
}
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