62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
export const getmark = () => {
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const setWatermark = (str) => {
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const id = "1.23452384164.123412416";
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if (document.getElementById(id) !== null) {
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document.body.removeChild(document.getElementById(id));
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}
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//创建一个画布
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const can = document.createElement("canvas");
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//设置画布的长宽
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can.width = 150;
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can.height = 120;
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const cans = can.getContext("2d");
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//旋转角度
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cans.rotate((-15 * Math.PI) / 180);
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cans.font = "18px Vedana";
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//设置填充绘画的颜色、渐变或者模式
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cans.fillStyle = "rgba(200, 200, 200, 0.40)";
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//设置文本内容的当前对齐方式
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cans.textAlign = "left";
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//设置在绘制文本时使用的当前文本基线
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// cans.textBaseline = "Middle";
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//在画布上绘制填色的文本（输出的文本，开始绘制文本的X坐标位置，开始绘制文本的Y坐标位置）
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cans.fillText(str, can.width / 8, can.height / 2);
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const div = document.createElement("div");
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div.id = id;
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div.style.pointerEvents = "none";
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div.style.top = "30px";
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div.style.left = "0px";
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div.style.position = "fixed";
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div.style.zIndex = "100000";
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div.style.width = document.documentElement.clientWidth + "px";
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div.style.height = document.documentElement.clientHeight + "px";
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div.style.background =
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"url(" + can.toDataURL("image/png") + ") left top repeat";
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document.body.appendChild(div);
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return id;
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};
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// 该方法只允许调用一次
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const watermark = (str) => {
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let id = setWatermark(str);
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setInterval(() => {
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if (document.getElementById(id) === null) {
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id = setWatermark(str);
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}
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}, 500);
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window.onresize = () => {
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setWatermark(str);
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};
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};
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const removeWatermark = () => {
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const id = "1.23452384164.123412416";
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if (document.getElementById(id) !== null) {
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document.body.removeChild(document.getElementById(id));
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}
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}
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return { setWatermark, watermark, removeWatermark };
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}; |