#Vue# Vue使用print实现打印及另存为PDF功能

步骤

（1）在src--utils里面加入print.js

 这个文件里面，也解决了 //canvass echarts图表转为图片 的问题

// 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.notPrint ? this.options.notPrint : '.no-print') + "{display:none;}</style>";
        str += "<style>html,body,div{height: auto!important;font-size:14px}</style>";

        return str;
    },

    getHtml: function () {
        var inputs = document.querySelectorAll('input');
        var textareas = document.querySelectorAll('textarea');
        var selects = document.querySelectorAll('select');
        var canvass = document.querySelectorAll('canvas');
        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')
                        }
                    }
                }
            }
        }
        //canvass echars图表转为图片
        for (var k4 = 0; k4 < canvass.length; k4++) {
            var imageURL = canvass[k4].toDataURL("image/png");
            var img = document.createElement("img");
            img.src = imageURL;
            img.setAttribute('style', 'max-width: 100%;');
            img.className = 'isNeedRemove'
            canvass[k4].parentNode.insertBefore(img,canvass[k4].nextElementSibling);
        }
        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:' + document.querySelector('#details').clientWidth + 'px;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 removes = document.querySelectorAll('.isNeedRemove');
        for (var k = 0; k < removes.length; k++) {
            removes[k].parentNode.removeChild(removes[k]);
        }

        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: (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里面引入

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

（3）将要打印的内容，设置一个id选择器以及ref

<div class="teacherData">
    <div id='printBill' ref="print">
        <div class="report_item">
           【打印的内容区域】
        </div>
    </div>
</div>

 （4）在需要调用的页面进行引入

设置打印的点击事件

<div class="print_wrap">
     <el-button type="primary"  @click="billPrintClick" >打印报告</el-button>
</div>

 billPrintClick(){
    this.$print(this.$refs.print) // 使用
  },

（5）在进行了以上4个步骤以后，我们会发现虽然可以打印，可是打印内容的css样式全部丢失，这个时候，我们只需要在<style lang="scss" scoped></style>将css样式复制一份在@media print里面

<style lang="scss" scoped>
 @media print {
    //调整多出一页空白页
    @page {
        size: auto; 
        margin: 6mm;
    }
    html {
        background-color: #ffffff;
        margin: 0px;
    }

    body {
        border: solid 1px #ffffff;
        margin: 10mm 15mm 10mm 15mm; 
    }
    #printBill {
        max-width: 1200px;
        margin: auto;
        .report_item {}
    }
/*样式内容*/
.teacherData {
    #printBill {
        max-width: 1200px;
        margin: auto;
        .report_item {
             }
        }
    }

（注意勾选这个背景图形，若没有勾选，那打印内容里面所有的背景颜色都会丢失）