vue实现打印功能（包括分页）

最近项目中碰到一个需求，需要前端预览打印当前页面的表格，而且表格是动态渲染的，所以在打印的时候需要分页打印。

1.下载print.js文件到本地

可以直接粘贴下面代码

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;
        console.log(dom, 'dom')
    }
    this.init();
};
Print.prototype = {
    /**
   * 初始化
   */
    init: function () {
        var content = this.getStyle() + this.getHtml();
        this.writeIframe(content);
    },
    /**
     * 配置属性扩展
     * @param {Object} obj 
     * @param {Object} obj2 
     */
    extend: function (obj, obj2) {
        for (var k in obj2) {
            obj[k] = obj2[k];
        }
        return obj;
    },
    /**
      复制原网页所有的样式
    */
    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>";
        // 去除height：100%样式，解决分页下，样式混乱问题
        str += "<style>html,body,div{height: auto!important;}</style>";
        return str;
    },
    // 表单赋值
    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;
    },
    /**
        创建iframe
    */
    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();
        this.toPrint(w);
        setTimeout(function () {
            document.body.removeChild(iframe)
        }, 100)
    },
    /**
    打印
    */
    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

2.在main.js里注册

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

3.做项目中使用

<template>
  <div>
    <div ref="print" id="print">
        <!--style="page-break-after:always" 表示添加分页功能  -->
       <div v-for="(item,index) in damageList" :key="index" style="page-break-after:always">
          <table border="1" style="border-collapse:collapse; width:70%; margin:20px auto;" id="page">
           <tr>
              <td class="w_td1" colspan="4">
                <span>保险人：</span>
                <input  v-model="item.InsurerName"  />
              </td>
            </tr>
          </table>
        </div>
    </div>
    <el-button type="info" plain size="medium" @click="Printing">打印</el-button>
  </div>
</template>
<script>
  export default {
      methods: {
       // 打印
        Printing () {
          this.$print(this.$refs.print)
        }
    }
  }
</script>
<style scoped>
/* 去除页眉页脚 */
@page {
  size: auto A4 landscape;
  margin: 3mm;
}
/* 增加padding */
#print {
  background: #fff;
  box-sizing: border-box;
  padding: 2rem 3rem 4rem;
}

</style>

下PDF格式文档 参考文章https://www.jianshu.com/p/c9bd1744345f

下载word文档格式（可带图片）参考文章 https://www.jianshu.com/p/3f2ec1e1fa92

下载表格功能 参考文章https://www.jianshu.com/p/f95beb80b3cf