const print = () => { if (!baseInfo.orderCode) { message.error("打印正在准备,请5秒后再点击") return } const el = document.getElementById("print-container") const iframe = document.createElement("IFRAME") let doc = null // iframe.setAttribute('style', 'position:absolute;top:0px;left:0px;width:100%;height:100%',); document.body.appendChild(iframe) doc = iframe.contentWindow.document // 引入打印的专有CSS样式,根据实际修改 doc.write(`<LINK rel="stylesheet" type="text/css" href="./orderPrint.css">`) doc.write(el.innerHTML) doc.close() // 获取iframe的焦点,从iframe开始打印 iframe.contentWindow.focus() iframe.onload = () => { iframe.contentWindow.print() document.body.removeChild(iframe) } if (navigator.userAgent.indexOf("MSIE") > 0) { document.body.removeChild(iframe) } const old = window.document.body.innerHTML const printPart = document.getElementById("print-container") window.document.body.innerHTML = "" window.document.body.appendChild(printPart) window.print() window.document.body.innerHTML = old window.location.reload() }优化这段代码
这段代码可以进行如下的优化:
避免在函数内部操作 DOM,最好将其作为参数传递进来,这样可以提高代码的可重用性和可维护性。
const print = (elId, cssUrl) => { const el = document.getElementById(elId) if (!el) { message.error("找不到打印内容,请检查elId") return } if (!baseInfo.orderCode) { message.error("打印正在准备,请5秒后再点击") return } const iframe = document.createElement("IFRAME") document.body.appendChild(iframe) const doc = iframe.contentWindow.document doc.write(`<LINK rel="stylesheet" type="text/css" href="${cssUrl}">`) doc.write(el.innerHTML) doc.close() iframe.contentWindow.focus() iframe.onload = () => { iframe.contentWindow.print() document.body.removeChild(iframe) } if (navigator.userAgent.indexOf("MSIE") > 0) { document.body.removeChild(iframe) } }
将打印的专有CSS样式和打印的内容分开处理,以便更好地维护和修改样式。
const print = (elId, cssUrl, printContent) => { const el = document.getElementById(elId) if (!el) { message.error("找不到打印内容,请检查elId") return } if (!baseInfo.orderCode) { message.error("打印正在准备,请5秒后再点击") return } const iframe = document.createElement("IFRAME") document.body.appendChild(iframe) const doc = iframe.contentWindow.document const link = document.createElement("link") link.rel = "stylesheet" link.type = "text/css" link.href = cssUrl doc.head.appendChild(link) doc.body.innerHTML = printContent || el.innerHTML iframe.contentWindow.focus() iframe.onload = () => { iframe.contentWindow.print() document.body.removeChild(iframe) } if (navigator.userAgent.indexOf("MSIE") > 0) { document.body.removeChild(iframe) } }
将打印内容从 DOM 中分离出来,以便在不同的场合下方便地调用。 ```javascript const printContent = (elId) => { const el = document.getElementById(elId) if (!el) { message.error("找不到打印内容,请检查elId") return "" } return el.innerHTML }
const print = (elId, cssUrl, printContent) => { if (!baseInfo.orderCode) { message.error("打印正在准备,请5秒后再点击") return } const iframe = document.createElement("IFRAME") document.body.appendChild(iframe) const doc = iframe.contentWindow.document const link = document.createElement("link") link.rel = "stylesheet" link.type = "text/css" link.href = cssUrl doc.head.appendChild(link) doc.body.innerHTML = printContent || printContent(elId) iframe.contentWindow.focus() iframe.onload = () => { iframe.contentWindow.print() document.body.removeChild(iframe) } if (navigator.userAgent.indexOf("MSIE") > 0) { document.body.removeChild(iframe) } } ```
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