准备print.js文件

// 打印类属性、方法定义
/* eslint-disable */
export const Print = function(dom, options) ,
    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 = ,
  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") +
      "{}</style>";

    return str;
  },

  getHtml: function()  else {
          inputs[k].removeAttribute("checked");
        }
      } else if (inputs[k].type == "text")  else 
    }

    for (var k2 = 0; k2 < textareas.length; k2++) 
    }

    for (var k3 = 0; k3 < selects.length; k3++)  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)  else {
        prevDom = currDom.cloneNode(true);
      }

      currDom = currDom.parentElement;
    }

    return prevDom;
  },

  writeIframe: function(content) , 100);
    };
  },

  toPrint: function(frameWindow) 
        } 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"
        );
      }
};

步骤二：

在需要使用的vue页面引入print.js

import { Print } from "@/assets/js/print.js";
使用实例：

<el-button class="ml-2x" @click="printPage('printTable')">打印</el-button>

<div ref="printTable">这是需要打印的内容</div>

// 打印A4纸  方法调用
printPage(val) {
  Print(this.$refs[val]);
},