vue打印浏览器页面功能的两种实现方法

     import Print from 'vue-print-nb'

div id="printTest" >
　　　　　　<p>明月照于山间</p>
　　　　　　<p>清风来于江上 </p>
　　　　</div>
　　　　<button v-print="'#printTest'">打印</button>

//print.js 里的代码
// 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.dom = dom;
    }
  
    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 += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</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')
              }
            }
          }
        }
      }
  
      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;";
      
      w = f.contentWindow || f.contentDocument;
      doc = f.contentDocument || f.contentWindow.document;
      doc.open();
      doc.write(content);
      doc.close();
      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);
      }
    }
  };
  
  const MyPlugin = {}
  MyPlugin.install = function (Vue, options) {
    Vue.prototype.$print = Print
  }
  
  export default MyPlugin

import Print from './plugs/print'
Vue.use(Print)

<template>
    <div>
        <!-- 点击按钮打印 -->
        <el-button type="primary" @click="printDemo">点击打印</el-button>
        
        <!--  <div ref="print">
            <h1>这里是打印内容</h1>
        </div>-->
        <img class="printsrcclass" ref='print' :src="printsrc"/>
    </div>    
</template>
<script>

export default {
    data(){
        return {}
    },
    methods: {
        // 点击打印
        printDemo(){
            setTimeout(() => {
                this.$print(this.$refs.print)
            }, 100);
        }
    },
    mounted() {

    }
}

this. print (this . print(this. print(this.refs.print,{‘no-print':‘.do-not-print-me-xxx'}) // 使用

const res2 = await fnApi(orderId);
 let myBlob = new Blob([res2.data], { type: 'image/jpeg'});
        var href = URL.createObjectURL(myBlob); // 创建对象超链接
        // 此时拿到图片地址 href，后面直接使用该地址即可
        let img = new Image();
        img.src = href;
        img.onload = () => {
          this.printsrc = href;
          this.$nextTick(() => {
            this.mypirntFN();
          })
        }