function exportDataPdf(el, fileName, splitClassName) {
// 防止页面数据被切割
const A4_WIDTH = 595
const A4_HEIGHT = 842
el.style.height = 'initial'
const pageHeight = el.scrollWidth / A4_WIDTH * A4_HEIGHT
// 获取分割dom，此处为class类名为item的dom
const domList = document.getElementsByClassName(splitClassName)
// 进行分割操作，当dom内容已超出a4的高度，则将该dom前插入一个空dom，把他挤下去，分割
let pageNum = 1 // pdf页数
const eleBounding = el.getBoundingClientRect()
for (let i = 0; i < domList.length; i++) {
const node = domList[i]
const bound = node.getBoundingClientRect()
const offset2Ele = bound.top - eleBounding.top
const currentPage = Math.ceil((bound.bottom - eleBounding.top) / pageHeight) // 当前元素应该在哪一页
if (pageNum < currentPage) {
pageNum++
const divParent = domList[i].parentNode // 获取该div的父节点
const newNode = document.createElement('div')
newNode.className = 'emptyDiv'
newNode.style.background = 'white'
newNode.style.height = (pageHeight * (pageNum - 1) - offset2Ele + 10) + 'px' // +30为了在换下一页时有顶部的边距
newNode.style.width = '100%'
divParent.insertBefore(newNode, node) //在每一个节点前面插入一个空的新节点，防止内容被分割截断
}
}
html2canvas(el, {
allowTaint: true,
}).then((canvas) => {
const canvasWidth = canvas.width;
const canvasHeight = canvas.height;
// 一页pdf显示html页面生成的canvas高度;a4纸的尺寸[595.28,841.89],pageHeight是应有高度吗，leftHeight是实际高度吗
const pageHeight = (canvasWidth / 592.28) * 841.89;
// 未生成pdf的html页面高度
let leftHeight = canvasHeight;
// 页面偏移
let position = 0;
// a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
const imgWidth = 595.28;
const imgHeight = (595.28 / canvasWidth) * canvasHeight;
//toDataURL()方法是返回一个包含图片展示的数据URL。
const pageData = canvas.toDataURL('image/jpeg', 1.0);
const pdf = new jsPDF("", "pt", "a4");
if (leftHeight < pageHeight) {
// 在pdf.addImage(pageData, 'JPEG', 左，上，宽度，高度)设置在pdf中显示；
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
} else {
// 分页
while (leftHeight > 0) {
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
leftHeight -= pageHeight;
position -= 841.89;
// 避免添加空白页
if (leftHeight > 0) {
pdf.addPage();
}
}
}
// 可动态生成
pdf.save(`${fileName}.pdf`);
})
}
const ele = document.getElementById('content_page');
exportDataPdf(ele, "名称", 'el-table__row')