addWaterMark() {
let id = "1.23452384164.123412416";
if (document.getElementById(id) !== null) {
document.body.removeChild(document.getElementById(id));
}
const employeeId = getEmployeeId();
const strArr = `${employeeId.nickName}-${sys_endDate()}`;
console.log(strArr);
let ctx = document.createElement("canvas");
ctx.width = 300;
ctx.height = 200;
ctx.style.display = "none";
let cans = ctx.getContext("2d");
cans.rotate((-20 * Math.PI) / 180);
cans.font = "16px Microsoft YaHei";
cans.fillStyle = "rgba(17, 17, 17, 0.15)";
cans.textAlign = "left";
cans.textBaseline = "Middle";
cans.fillText(strArr, 0, 100);
cans.save();
let div = document.createElement("div");
div.id = id;
div.style.pointerEvents = "none";
div.style.top = "30px";
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(" + ctx.toDataURL("image/png") + ") left top repeat";
document.body.appendChild(div);
// return ctx.toDataURL();
},
