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src/utils/watermark.js

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+/**  水印添加方法  */
+
+let setWatermark = (str1, str2) => {
+    let id = '1.23452384164.123412415'
+
+    if (document.getElementById(id) !== null) {
+        document.body.removeChild(document.getElementById(id))
+    }
+
+    let can = document.createElement('canvas')
+    // 设置canvas画布大小
+    can.width = 250
+    can.height = 180
+
+    let cans = can.getContext('2d')
+    cans.rotate(-22.5 * Math.PI / 180) // 水印旋转角度
+    cans.font = '15px Vedana'
+    cans.fillStyle = '#666666'
+    cans.textAlign = 'center'
+    cans.textBaseline = 'Middle'
+    cans.fillText(str1, can.width / 2, can.height) // 水印在画布的位置x，y轴
+    cans.fillText(str2, can.width / 2, can.height + 22)
+
+    let div = document.createElement('div')
+    div.id = id
+    div.style.pointerEvents = 'none'
+    div.style.top = '40px'
+    div.style.left = '0px'
+    div.style.opacity = '0.15'
+    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
+}
+
+// 添加水印方法
+export const setWaterMark = (str1, str2) => {
+    let id = setWatermark(str1, str2)
+    if (document.getElementById(id) === null) {
+        id = setWatermark(str1, str2)
+    }
+}
+
+// 移除水印方法
+export const removeWatermark = () => {
+    let id = '1.23452384164.123412415'
+    if (document.getElementById(id) !== null) {
+        document.body.removeChild(document.getElementById(id))
+    }
+}