vue局部打印多页面pdf

技术背景

1. html打印程pdf,使用的官方提供的window.print()
2. 打印的样式 @media print {}

方法一

            const printContent = this.$refs.bodyright;
            var textInput = printContent.getElementsByTagName("input");
            for (var i = 0; i < textInput.length; i++) {
                textInput[i].setAttribute("value", textInput[i].value)
            }
             var textTextarea = printContent.getElementsByTagName("textarea");
            for (var i = 0; i < textTextarea.length; i++) {
                textTextarea[i].innerHTML = textTextarea[i].value
            }
             // 创建一个隐藏的iframe
            const iframe = document.createElement('div');
            document.body.appendChild(iframe);
            iframe.innerHTML = printContent.innerHTML
            iframe.setAttribute('style', 'position: fixed;left:0;top:0;width:100%;height:100vh;z-index:9999;background:#fff');
             window.print();
            document.body.removeChild(iframe);
           
  }

缺点: 只能打一个页面
有点:不会刷新

方法二

  printContent{
   const printContent = this.$refs.bodyright;
   document.body.innerHTML=printContent.innerHTML;
      // 执行打印操作
      window.print();
      // 重新加载样式
      window.location.reload();
        }

缺点: 替换时页面会刷新,保存不了状态
有点:可以打印多页面

方法三

  printContent{
       let str = [], s = [];
            const printContent = this.$refs.bodyright;

            var textInput = printContent.getElementsByTagName("input");
            for (var i = 0; i < textInput.length; i++) {
                textInput[i].setAttribute("value", textInput[i].value)
            }
            var textTextarea = printContent.getElementsByTagName("textarea");
            for (var i = 0; i < textTextarea.length; i++) {
                textTextarea[i].innerHTML = textTextarea[i].value
            }
            var textCheckbox = printContent.getElementsByTagName("checkbox");
            for (var i = 0; i < textCheckbox .length; i++) {
             if(textCheckbox [i].checked){
                textCheckbox [i].checked= textCheckbox [i].checked
                }
                
            }
              var textRadio = printContent.getElementsByTagName("radio");
            for (var i = 0; i < textRadio.length; i++) {
                if(textRadio[i].checked){
                textRadio[i].checked= textRadio[i].checked
                }
                
            }
            
            let sheets = document.styleSheets;
            for (let i = 0; i < sheets.length; i++) {
                let ruleList = sheets[i].cssRules;
                for (let j = 0; j < ruleList.length; j++) {
                   s.push(ruleList[j].cssText)
                }
            }
             // ${s.join(' ')}
            console.log(s.join(' '), '=====>')


            const iframe = document.createElement('iframe');
             iframe.style.display = 'none';
            document.body.appendChild(iframe);
            const printDocument = iframe.contentWindow.document;
             printDocument.open();
             printDocument.write('');
             printDocument.write(``);
             printDocument.write('');
             printDocument.write('
');
             printDocument.write(printContent.innerHTML);
             printDocument.write('
');
             printDocument.write('');
             printDocument.close();
            // 等待iframe内容加载完成后再执行打印
             iframe.onload = function () {
                 iframe.contentWindow.print();
                 document.body.removeChild(iframe);
             };
        }

缺点: 安排多余的页面
有点:可以打印多页面

方法四

全选复制 另存为print.js

 // 打印类属性、方法定义
/* eslint-disable */
const Print = function (dom, options) {
    if (!(this instanceof Print)) return new Print(dom, options);
   
    this.options = this.extend({
      'noPrint': '.no-print'
    }, options);
   
    if ((typeof dom) === "string") {
      this.dom = document.querySelector(dom);
    } else {
      this.isDOM(dom)
      this.dom = this.isDOM(dom) ? dom : dom.$el;
    }
   
    this.init();
  };
  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 += "";
      str += "";
      return str;
    },
   
    getHtml: function () {
      var inputs = document.querySelectorAll('input');
      var textareas = document.querySelectorAll('textarea');
      var selects = document.querySelectorAll('select');
   
      for (var k = 0; k < inputs.length; k++) {
        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)
        } else {
          inputs[k].setAttribute('value', inputs[k].value)
        }
      }
   
      for (var k2 = 0; k2 < textareas.length; k2++) {
        if (textareas[k2].type == 'textarea') {
          textareas[k2].innerHTML = textareas[k2].value
        }
      }
   
      for (var k3 = 0; k3 < selects.length; k3++) {
        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')
              }
            }
          }
        }
      }
   
      return this.dom.outerHTML;
    },
   
    writeIframe: function (content) {
      var w, doc, iframe = document.createElement('iframe'),
        f = document.body.appendChild(iframe);
      iframe.id = "myIframe";
      //iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
      iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
      w = f.contentWindow || f.contentDocument;
      doc = f.contentDocument || f.contentWindow.document;
      doc.open();
      doc.write(content);
      doc.close();
      var _this = this
      iframe.onload = function(){
        _this.toPrint(w);
        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);
      }
    },
    isDOM: (typeof HTMLElement === 'object') ?
      function (obj) {
        return obj instanceof HTMLElement;
      } :
      function (obj) {
        return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
      }
  };
  const MyPlugin = {}
  MyPlugin.install = function (Vue, options) {
    // 4. 添加实例方法
    Vue.prototype.$print = Print
  }
  export default MyPlugin

main.js内挂载（注意引入路径是你刚刚保存的地址）

import print from '@/utils/print.js'
Vue.use(print);

二、使用
在你要打印的元素上 写上ref=“print”

    <div class="box" ref="print">
                    ...
    </div>
    <el-button type="primary" @click="print">打 印</el-button>

methods

  methods:{
    print(){
      this.$print(this.$refs.print); // 使用
    }
  }

另外不需要打印的元素加上 no-print类名 即可不打印

   <div class="no-print">不要打印我</div>

参考:https://blog.csdn.net/m0_60067716/article/details/121338755