vue打印插件，使用教程

第一步：文件里新增一个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 += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";
    //支持多页打印
    str += "<style>html,body,div{height: auto!important;font-size:8px; margin:0}</style>";
    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')
            }
          }
        }
      }
    }
    // 包裹要打印的元素
    // fix: https://github.com/xyl66/vuePlugs_printjs/issues/36
    let outerHTML = this.wrapperRefDom(this.dom).outerHTML
    return outerHTML;
  },
  // 向父级元素循环，包裹当前需要打印的元素
  // 防止根级别开头的 css 选择器不生效
  wrapperRefDom: function (refDom) {
    
    
    let prevDom = null
    let currDom = refDom
    // 判断当前元素是否在 body 中，不在文档中则直接返回该节点
    if (!this.isInBody(currDom)) return currDom

    while (currDom) {
    
    
      if (prevDom) {
    
    
        let element = currDom.cloneNode(false)
        element.appendChild(prevDom)
        prevDom = element
      } else {
    
    
        prevDom = currDom.cloneNode(true)
      }

      currDom = currDom.parentElement
    }

    return prevDom
  },

  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);
    }
  },
  // 检查一个元素是否是 body 元素的后代元素且非 body 元素本身
  isInBody: function (node) {
    
    
    return (node === document.body) ? false : document.body.contains(node);
  },
  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

第二步 ：在main.js 初始化print

import Print from './common/js/print'  //注意自己的文件路径 
Vue.use(Print);

第三步 ：给打印的内容盒子加ref属性

     <template>
      <div id="content"  ref="print-content">
      	  <!-- 文章详情 -->
      	  <div v-show="!isPrint">不需要打印的内容</div>
      	  <div>需要打印的内容</div>
      </div>
      </template>
      <script>
		export default {
    
    
			data() {
    
    
    			return {
    
    
     			 isPrint: false
      			}
      		}
		}
      </script>

第四步 ：点击打印按钮，实现打印

<div class="btn" @click="print" v-show="!isPrint">打印</div>

  // 打印
    print() {
    
    
      this.isPrint = true;
      setTimeout(() => {
    
    
        this.$print(this.$refs['print-content'])  //打印
        this.isPrint = false;
      });
    },