// 页面添加水印效果
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const setWatermark = (str: string) => {
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const id = '1.23452384164.123412416';
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if (document.getElementById(id) !== null) document.body.removeChild(<HTMLElement>document.getElementById(id));
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const can = document.createElement('canvas');
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can.width = 200;
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can.height = 130;
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const cans = <CanvasRenderingContext2D>can.getContext('2d');
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cans.rotate((-20 * Math.PI) / 180);
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cans.font = '12px Vedana';
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cans.fillStyle = 'rgba(200, 200, 200, 0.30)';
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cans.textBaseline = 'middle';
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cans.fillText(str, can.width / 10, 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 = '0px';
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div.style.left = '0px';
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div.style.position = 'fixed';
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div.style.zIndex = '10000000';
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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 = `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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/**
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* 页面添加水印效果
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* @method set 设置水印
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* @method del 删除水印
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*/
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const watermark = {
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// 设置水印
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set: (str: string) => {
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let id = setWatermark(str);
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if (document.getElementById(id) === null) id = setWatermark(str);
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},
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// 删除水印
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del: () => {
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let id = '1.23452384164.123412416';
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if (document.getElementById(id) !== null) document.body.removeChild(<HTMLElement>document.getElementById(id));
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},
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};
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// 导出方法
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export default watermark;
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