2022年5月29日从svn移到git

src/utils/warterMark.js

@@ -0,0 +1,63 @@
+let watermark = {}
+
+let setWatermark = (text, sourceBody) => {
+  //let id = Math.random() * 10000 + '-' + Math.random() * 10000 + '/' + Math.random() * 10000
+  let id='boedx-water-mark';
+  if (document.getElementById(id) !== null) {
+    document.body.removeChild(document.getElementById(id))
+  }
+
+  let can = document.createElement('canvas')
+  can.width = 400 //设置水印之间的左右间距
+  can.height = 240 //设置水印之间的上下间距
+
+  let cans = can.getContext('2d')
+  cans.rotate(-20 * Math.PI / 180)
+  cans.font = '18px Vedana'
+  cans.fillStyle = 'rgba(233, 233, 233, 0.5)'
+  cans.textAlign = 'left'
+
+
+  cans.textBaseline = 'Middle'
+  cans.fillText(text, can.width / 20, can.height)
+
+  let water_div = document.createElement('div');
+  water_div.id = id
+  water_div.style.pointerEvents = 'none'
+  water_div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'
+  if (sourceBody) {
+    water_div.style.width = '100%'
+    water_div.style.height = '100%'
+    sourceBody.appendChild(water_div)
+  } else {
+    water_div.style.top = '3px'
+    water_div.style.left = '0px'
+    water_div.style.position = 'fixed'
+    water_div.style.zIndex = '10'
+    water_div.style.width = document.documentElement.clientWidth + 'px'
+    water_div.style.height = document.documentElement.clientHeight + 'px'
+    document.body.appendChild(water_div)
+  }
+
+  return id
+}
+
+/**
+ *  该方法只允许调用一次
+ *  @param:
+ *  @text == 水印内容
+ *  @sourceBody == 水印添加在哪里，不传就是body
+ * */
+watermark.set = (text, sourceBody) => {
+  let id = setWatermark(text, sourceBody)
+  setInterval(() => {
+    if (document.getElementById(id) === null) {
+      id = setWatermark(text, sourceBody)
+    }
+  }, 2000)
+  window.onresize = () => {
+    setWatermark(text, sourceBody)
+  }
+}
+
+export default watermark