vue调用日期_Vue 前端开发——打印功能实现

业务场景常见于一些订单记录发票等的一些pdf 打印，保留了样式，可以打印彩色内容也可以打印黑白内容，如果业务复杂的比如添加水印的目前不支持，一般会特定处理，通过canvas 的方式处理。

封装打印脚本

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 (dom instanceof 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 +=      " +
      (this.options.noPrint ? this.options.noPrint : ".no-print") +
"{display:none;}";
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:    HTMLElement instanceof Object      ? function(obj) {
      
return obj instanceof HTMLElement;
        }      : function(obj) {
      
return (
            obj &&            obj instanceof Object &&            obj.nodeType === 1 &&
            obj.nodeName instanceof String          );        }};const MyPlugin = {};MyPlugin.install = function(Vue, options) {
      
  // 4. 添加实例方法
  Vue.prototype.$print = Print;
};export default MyPlugin;

print.js

注册插件

在vue项目main.js 中加入

import Print from "./print";
 Vue.use(Print);

使用测试

说明：在需要打印的地方添加ref,不需要打印的地方添加 no-print 的class 类名，通过 $print 去调用需要打印的ref(或者用定义id然后调用id节点的方式也可以，vue中推荐用ref)

说明：在需要打印的地方添加ref,通过 $print 去调用需要打印的ref