// 页面添加水印效果
const setWatermark = (str: any) => {
    const id = "1.23452384164.123412416"
    if (document.getElementById(id) !== null) document.body.removeChild(document.getElementById(id) as any)
    const can = document.createElement("canvas")
    can.width = 250
    can.height = 180
    const cans: any = can.getContext("2d")
    cans.rotate((-20 * Math.PI) / 180)
    cans.font = "12px Vedana"
    cans.fillStyle = "rgba(200, 200, 200, 0.30)"
    cans.textAlign = "center"
    cans.textBaseline = "Middle"
    cans.fillText(str, can.width / 10, can.height / 2)
    const div = document.createElement("div")
    div.id = id
    div.style.pointerEvents = "none"
    div.style.top = "35px"
    div.style.left = "0px"
    div.style.position = "fixed"
    div.style.zIndex = "10000000"
    div.style.width = document.documentElement.clientWidth + "px"
    div.style.height = document.documentElement.clientHeight + "px"
    div.style.background = `url(${can.toDataURL("image/png")}) left top repeat`
    document.body.appendChild(div)
    return id
};

const watermark = {
    // 设置水印
    set: (str: any) => {
        let id = setWatermark(str)
        if (document.getElementById(id) === null) id = setWatermark(str)
    },
    // 删除水印
    del: () => {
        let id = '1.23452384164.123412416'
        if (document.getElementById(id) !== null) document.body.removeChild(document.getElementById(id) as any)
    }
}

export default watermark