最新vue项目添加水印

在utils文件夹中创建 wartermark.ts 文件（位置看自己的组件放那，这都行），内容如下：

"use strict";

const setWatermark = (str: any) => {
  const id = "1.23452384164.123412416";

  if (document.getElementById(id) !== null) {
    document.body.removeChild(document.getElementById(id) as any);
  }

  //创建一个画布
  const can = document.createElement("canvas");
  //设置画布的长宽
  can.width = 250;
  can.height = 120;

  const cans: any = can.getContext("2d");
  //旋转角度
  cans.rotate((-15 * Math.PI) / 150);
  cans.font = "18px Vedana";
  //设置填充绘画的颜色、渐变或者模式
  cans.fillStyle = "rgba(200, 200, 200, 0.30)";
  //设置文本内容的当前对齐方式
  cans.textAlign = "left";
  //设置在绘制文本时使用的当前文本基线
  cans.textBaseline = "Middle";
  //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）
  cans.fillText(str, can.width / 8, can.height / 2);

  const div = document.createElement("div");
  div.id = id;
  div.style.pointerEvents = "none";
  div.style.top = "35px";
  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(" + can.toDataURL("image/png") + ") left top repeat";
  document.body.appendChild(div);
  return id;
};
const watermark = {
  // 该方法只允许调用一次
  set: (str: any) => {
    let id = setWatermark(str);
    setInterval(() => {
      if (document.getElementById(id) === null) {
        id = setWatermark(str);
      }
    }, 500);
    window.onresize = () => {
      setWatermark(str);
    };
  }
}
export default watermark;

2、在API.vue文件中引用 wartermark.ts　

<script lang="ts">
import './assets/styles/base.scss'
import { Component, Vue } from 'vue-property-decorator'
import { theme, getQueryString } from '@/utils/util'
import logoutUrl from '@/utils/api/logoutUrl'

import Watermark from '@/utils/main/wartermark';

export default class App extends Vue {
  mounted () {
    Watermark.set("水印内容")
  }
  
}
</script>