vue中使用print.js实现页面打印并增加水印

1.安装print.js

npm install print-js --save

2.在main.js文件中引入并注册(我使用的是print.js的源码文件，并且做了一修改）

//引入
import Print from './utils/print'

//注册
Vue.use(Print); //注册

3.在页面中使用

<template>
<div class="detailsPrint">
 <div class="move" ref="pdfContent" id="pdfContent">
 需要打印的内容 
 </div>
  <el-button type="primary" @click="printPDF">打 印</el-button>
 </div>
</template>

<script>
export default {
  name: "",

  data() {
    return {
    };
  },
  methods: {
    // 打印PDF
    printPDF() {
      this.$nextTick(() => {
          this.$print(this.$refs.pdfContent, {
            watermark: {
              companyName: '公司名称',
              name: '姓名',
              date: '2024-08-01',
            }
      });
    }
  },
};
</script>
<style scoped>
//我希望打印出来的格式是A4纸的格式
@media print {
  @page {
    size: B5(JIS);
    margin: 10mm 16mm;
    margin-top: 8mm;
    margin-bottom: 8mm;
  }
}
</style>

4.在utils下新增print.js

/* eslint-disable */
const Print = function (dom, options) {
  if (!(this instanceof Print)) return new Print(dom, options);

  this.options = this.extend({
    'noPrint': '.no-print',
    'watermark': {} // 接受单个水印数据对象
  }, options);

  if ((typeof dom) === "string") {
    this.dom = document.querySelector(dom);
  } else {
    this.dom = dom;
  }
  setTimeout(() => {
    this.init();
  }, 2000);
};

Print.prototype = {
  init: function () {
    var content = this.getStyle() + this.getHtml();
    this.writeIframe(content);
  },

  extend: function (obj, obj2) {
    for (var k in obj2) {
      obj[k] = obj2[k];
    }
    return obj;
  },

  getStyle: function () {
    var str = "",
      styles = document.querySelectorAll('style,link');
    for (var i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML;
    }
    str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";

    str += `
      <style>
        .watermark {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          opacity: 0.2;
          pointer-events: none;
        }
        .watermark-content {
          color:rgba(0,0,0,0.4)
          text-align: center;
          transform: rotate(-45deg);
          font-size: 24px;
        }

        /* 打印样式 */
        @media print {
          body, html {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
          }
          .watermark {
            opacity: 0.2;
            pointer-events: none;
            position: fixed; /* 修正水印固定位置 */
          }
          .watermark-content {
            text-align: center;
            transform: rotate(-45deg);
            font-size: 24px;
             color:rgba(0,0,0,0.4)
          }
          /* 隐藏不需要打印的内容 */
          ${this.options.noPrint} {
            display: none !important;
          }
          /* 设置A4纸大小和页边距 */
          @page {
            size: B5(JIS);
            margin: 10mm 16mm;
            margin-top: 8mm;
            margin-bottom: 8mm;
          }
        }
      </style>
    `;

    return str;
  },

  getHtml: function () {
    var inputs = document.querySelectorAll('input');
    var textareas = document.querySelectorAll('textarea');
    var selects = document.querySelectorAll('select');

    for (var k in inputs) {
      if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
        if (inputs[k].checked == true) {
          inputs[k].setAttribute('checked', "checked")
        } else {
          inputs[k].removeAttribute('checked')
        }
      } else if (inputs[k].type == "text") {
        inputs[k].setAttribute('value', inputs[k].value)
      }
    }

    for (var k2 in textareas) {
      if (textareas[k2].type == 'textarea') {
        textareas[k2].innerHTML = textareas[k2].value
      }
    }

    for (var k3 in selects) {
      if (selects[k3].type == 'select-one') {
        var child = selects[k3].children;
        for (var i in child) {
          if (child[i].tagName == 'OPTION') {
            if (child[i].selected == true) {
              child[i].setAttribute('selected', "selected")
            } else {
              child[i].removeAttribute('selected')
            }
          }
        }
      }
    }

    // 使用传递的单个水印数据对象生成多个随机位置的水印
    var watermarkHtml = '';
    var numWatermarks = 12; // 生成的水印数量
    var leftStart = -50; // 修改此处，从最左边开始的起始位置（百分比）
    var leftEnd = 95; // 最右边的结束位置（百分比）
    var topPositions = ['20%', '40%', '60%', '80%']; // 垂直方向的位置

    var step = (leftEnd - leftStart) / (numWatermarks - 1); // 计算步长

    for (var i = 0; i < numWatermarks; i++) {
      var leftPosition = `${leftStart + i * step}%`;
      var topPosition = topPositions[i % topPositions.length];
      
      watermarkHtml += `
         <div class="watermark" style="top: ${topPosition}; left: ${leftPosition};">
           <div class="watermark-content">
             <div> ${this.options.watermark.companyName}</div>
             <div> ${this.options.watermark.name}</div>
             <div> ${this.options.watermark.date}</div>
           </div>
         </div>
       `;
    }

    return this.dom.outerHTML + watermarkHtml;
  },

  writeIframe: function (content) {
    var iframe = document.createElement('iframe');
    iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
    document.body.appendChild(iframe);

    var doc = iframe.contentDocument || iframe.contentWindow.document;
    doc.open();
    doc.write(content);
    doc.close();

    this.toPrint(iframe.contentWindow);

    setTimeout(function () {
      document.body.removeChild(iframe);
    }, 100);
  },

  toPrint: function (frameWindow) {
    try {
      setTimeout(function () {
        frameWindow.focus();
        try {
          if (!frameWindow.document.execCommand('print', false, null)) {
            frameWindow.print();
          }
        } catch (e) {
          frameWindow.print();
        }
        frameWindow.close();
      }, 10);
    } catch (err) {
      console.log('err', err);
    }
  }
};

const MyPlugin = {};
MyPlugin.install = function (Vue, options) {
  Vue.prototype.$print = Print;
};

export default MyPlugin;

原文地址：https://blog.csdn.net/weixin_58495461/article/details/140851599

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