使用html2canvas将html转pdf，由于table表的水平和竖直有滚动条导致显示不全（或者有空白）

结果：

业务：将页面右侧的table打印成想要的格式的pdf，首先遇到的问题是table表上下左右都有滚轮而html2canvas相当于屏幕截图，那滚动区域如何显示出来是个问题？

gif有点模糊，但是大致功能可以看出

可复制代码在最下面

参考文章：主要思路就是table既然原始高度宽度不对，那你在转pdf之前就把他的宽度高度还原成真实的高度宽度然后打印成pdf，最后再转成原始高度宽度。（值得注意的是画布的高度宽度也要设置，和table一样就行）

html代码：

script代码

table表上有个“导出按钮”，点击就会触发handleExport函数

全部代码：

html：

      <divref="myContainer"id="fatherDiv"class="demo-form-inline"style="height: calc(100% - 120px)"><el-tableref="workforceTable":data="tableData"[e-mail]="drop($event)"@dragover.native="allowDrop($event)"stripe:span-method="objectSpanMethod":cell-class-name="tableCellClassName"max-height="100%"height="100%"class="demo-form-inline"id="factTable"><el-table-columnprop="time"label="时间"width="70"align="center"fixed></el-table-column><el-table-column:prop="item.sectorCode":label="item.sectorName"v-for="item in sectorList":key="item.sectorCode"align="center"><el-table-column:prop="seat.seatId":label="seat.seatName"v-for="seat in item.seatList":key="seat.seatId"align="center"min-width="102px"><template slot-scope="scope"><span:defProp="seat.seatId":defTime="scope.row.time":defIndex="scope.$index"></span><spanclass="el-tag el-tag--light"defid="scope.row[seat.seatId]"v-if="scope.row[seat.seatId]"><!-- 姓名(班组名称) --><!-- {{ scope.row[seat.seatId]+"("+scope.row["team"+seat.seatId]+")" }} --><!-- 姓名 -->{{ scope.row[seat.seatId] }}<iclass="el-tag__close el-icon-close"@click="onRemovePerson(scope.$index, seat.seatId)"v-if="isManual"></i></span></template></el-table-column></el-table-column><el-table-column:prop="seat.seatId":label="seat.seatName"v-for="seat in seatList":key="seat.seatId"align="center"min-width="102px"><template slot-scope="scope"><span:defProp="seat.seatId":defTime="scope.row.time":defIndex="scope.$index"></span><spanclass="el-tag el-tag--light"defid="scope.row[seat.seatId]"v-if="scope.row[seat.seatId]"><!-- 姓名(班组名称) --><!-- {{ scope.row[seat.seatId]+"("+scope.row["team"+seat.seatId]+")" }} --><!-- 姓名 -->{{ scope.row[seat.seatId] }}<iclass="el-tag__close el-icon-close"@click="onRemovePerson(scope.$index, seat.seatId)"v-if="isManual"></i></span></template></el-table-column></el-table></div>

script代码：

    handleExport() {this.$nextTick(() => {let pdfName =(this.deptRegion == "TWR"? "塔台": this.deptRegion == "APP"? "进近": "区域") +"管制室" +this.$common.parseTime(this.selectedMonth, "{y}/{m}/{d}") +"日排班表";document.getElementsByClassName("demo-form-inline")[0].classList.add("export-pdf-style");this.generatePDF(this.$refs.myContainer, pdfName);});},generatePDF(el, name) {let bodyWrapper = document.querySelector("#factTable .el-table__body-wrapper");let headerNode = document.querySelector("#factTable .el-table__header-wrapper");bodyWrapper.style.height = `${bodyWrapper.scrollHeight}px`;document.getElementById("fatherDiv").style.width = `${bodyWrapper.scrollWidth}px`;document.getElementById("fatherDiv").style.height = `${bodyWrapper.scrollHeight + headerNode.scrollHeight不}px`;setTimeout(function () {html2canvas(el, {scale: 4,width: bodyWrapper.scrollWidth + 60, // 为了使横向滚动条的内容全部展示，这里必须指定！！height: bodyWrapper.scrollHeight + headerNode.scrollHeight ,}).then((canvas) => {let contentWidth = canvas.width;let contentHeight = canvas.height;let pageHeight = (contentWidth / 592.28) * 841.89;      //一页pdf显示html页面生成的canvas高度;let leftHeight = contentHeight;      //未生成pdf的html页面高度let position = 0;          //页面偏移let imgWidth = 595.28;     //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高let imgHeight = (592.28 / contentWidth) * contentHeight;let pageData = canvas.toDataURL("image/jpeg", 1.0);let pdf = new jsPDF("", "pt", "a4");if (leftHeight < pageHeight) {          //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)pdf.addImage(pageData, "JPEG", 5, 30, imgWidth, imgHeight);       //当内容未超过pdf一页显示的范围，无需分页} else {while (leftHeight > 0) {pdf.addImage(pageData, "JPEG", 5, position, imgWidth, imgHeight); //arg3-->距离左边距;arg4-->距离上边距;arg5-->宽度;arg6-->高度leftHeight -= pageHeight;position -= 841.89;if (leftHeight > 0) {           //避免添加空白页pdf.addPage();                //添加新页}}}pdf.save(`${name}.pdf`);document.getElementById("fatherDiv").style.width = `${100}%`;document.getElementById("fatherDiv").style.height = `calc(100% - 120px)`;document.getElementsByClassName("demo-form-inline")[0].classList.remove("export-pdf-style");});}, 200);},

css代码：

.export-pdf-style >>> .el-table ,
.export-pdf-style >>> .el-tag{background: white !important;color: black !important;
}.export-pdf-style >>> .el-table th,
.export-pdf-style >>> .el-table .el-table__cell {color: black;border: 1px solid black;background: white !important;
}