// 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 = "100000";
    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);
        window.onresize = () => { 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;