打印功能實現（ie兼容）

• 設置打印區域 ref=‘printDiv’
• 清除按鈕、輸入框線條樣式
• 打印
• 恢復頁面樣式

具體實現

定義print方法

// print 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.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 = thisiframe.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';}};export default Print

方法調用

handlePrint(){console.log('///',this.$refs.printDiv)let val = getExplorerInfo()this.$refs.printBtn.style.display = 'none'let btn = document.querySelectorAll('.el-button')let input = document.querySelectorAll('input')let textarea = document.querySelectorAll('textarea')if(val.type!=='IE'){btn.forEach(item=>item.style.display='none')input.forEach(item=>item.style.border='0')textarea.forEach(item=>item.style.border='0')//調用 print 方法print(this.$refs.printDiv)//打印后恢復樣式input.forEach(item=>item.style.border='1')textarea.forEach(item=>item.styleborder='1')}else{//ie兼容配置let el = document.createElement('OBJECT')el.setAttribute('classid','CLSID:8856F961-340A-11D0-A96B-00C04FD705A2')el.setAttribute('height','0')el.setAttribute('id','wb')el.setAttribute('name','wb')el.setAttribute('width','0')document.head.appendChild(el)console.log(this.$refs.printDiv.innerHTML)for(let i =0;i<btn.length;i++){btn[i].style.display='none'}for(let i =0;i<input.length;i++){input[i].style.border = '0'input[i].setAttribute('value',input[i].value)}for(let i =0;i<textarea.length;i++){textarea[i].style.border = '0'}let dom = this.$refs.printDiv.innerHTMLdocument.body.innerHTML = dom// dom.textContent = this.$refs.printDiv.textContentdocument.querySelector('#wb').ExecWB(7,1)// window.print()for(let i =0;i<btn.length;i++){(btn[i].style.display='block')&&(btn[i].style.marginLeft='12px')}for(let i =0;i<input.length;i++){input[i].style.border = '1'}for(let i =0;i<textarea.length;i++){textarea[i].style.border = '1'}document.head.removeChild(el)}this.$refs.printBtn.style.display = 'block'// window.location.reload()},

總結

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