首先：在 common 文件夹下面创建 print.js 文件 代码如下
// 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>";
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: (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
在 main.js 注册该模块
// 打印
import print from '@/common/print'
Vue.use(print)
创建需要打印的组件 Print.vue，在父组件引入该组件，并注册
// 引入
import print from './Print'
// 注册
components:{
productionTaskListDetail,print},
父组件（也就是触发事件的组件）的基础布局
<!--触发事件按钮-->
<el-button type="primary" icon="el-icon-printer" circle size="mini" plain @click="printerView(scope.row)"></el-button>
<!--打印的页面-->
<section ref="printer" >
<print @changeData='changeData' :printId="printId" class="printer"></print>
</section>
调用打印的方法
printerView(val) {
this.$print(this.$refs.printer)
},
给打印的页面添加媒体查询样式（视图隐藏组件设置此样式）
<style scoped>
@media screen {
.printer {
display: none;
}
}
</style>
使用注意：如果组件需要父组件的值可使用以下逻辑。所需打印的组件如果有图片，打印预览时可能不会显示图片，解决办法，图片加载完成给父组件传递一个参数 printerId，这里的 printerId 也是父组件传给子组件的数据，父组件接收到 printerId ，且 printerId 不为空时执行 打印
// 给子组件传id
printerView(val) {
this.printId = val.id;
},
// 判断子组件传过来的id，如果不为空证明子组件已经渲染结束
changeData(data) {
if(!!data) {
this.$print(this.$refs.printer)
this.printId = ''
}
}
// 图片渲染成功给父组件传递参数
<div class="image">
<el-image @load="function(e) {
$emit('changeData',printerId)
}" class="image-possion" style="width: 150px; height: 150px" :src="`/rebar/base/downQr/?key=SCRUD&id=${
headerData.id}`"></el-image>
</div>