Pure client-side and pure server-side implementation solutions for HTML to PDF conversion

// html2pdf.js

const puppeteer = require('puppeteer');
(async function(){
    // Start the service const browser = await puppeteer.launch();
    // Open the tab const page = await browser.newPage();
    // Go to this address await page.goto('https://koa.bootcss.com/#context');
    // Convert html page to pdf and save to path
    await page.pdf({path:"test.pdf",format:'A4'})
    // Close the browser await browser.close();
})();

   // DOM is the DOM node to be converted html2canvas(DOM,{
        backgroundColor:"#ffffff",
        width:width,
        height:height,
        scale:2,
        allowTaint:true,
    }).then((canvas)=>{
        // canvas is the canvas after successful conversion})

   // Create an instance let pdf = new jsPDF('','pt','a4');
    // Add the image to the pdf file // The first parameter is the file format (base64) to be inserted, the second is the file format // The third and fourth are the coordinates of the upper left corner of the image, and the last two are the width and height of the image after insertion pdf.addImage(image,'JPEG',10,10,height,width);
    // Add a new page pdf.addPage()
    // Save the pdf file pdf.save()

  // canvas is the image to be cropped // sx, sy are the coordinates for starting cropping // swidth, sHeight are the width and height of the cropping // dx, dy are the coordinates for inserting the cropped image into the canvas // sWidth, sHeight are the width and height of the cropped image in the canvas cxt.drawImage(canvas, sx, sy, sWidth, sHeight, dx, dy, sWidth, sHeight);

/**
 * @description: Convert form to pdf file* @return: pdf
 */
onSubmit(){
    // This is the form I want to convert, there are many identical forms in it let form = this.$refs.form;
    // Get the width and height of the element let width = form.getBoundingClientRect().width;
    let height = form.getBoundingClientRect().height;
    html2canvas(form,{
        backgroundColor:"#ffffff",
        width:width,
        height:height,
        scale:2,
        allowTaint:true,
    }).then((canvas)=>{
        let pdf = new jsPDF('','pt','a4');
        // Cut the picture let canvasList = this.splitCanvas(canvas,this.forms.length);

        // Traverse the canvas list and add an image to each page canvasList.forEach((item,index)=>{
            // Convert the image format to base64
            let itemImage = item.toDataURL('image/jpeg',1.0);
            // Reserve 10px margin, the width of A4 paper is 595px on a 72-resolution monitor
            pdf.addImage(itemImage,'JPEG',10,10,575.28,575.28/item.width*item.height);
            // If it is not the last page, paginate index == this.forms.length-1 ? '' : pdf.addPage();
        })
        // Save the file let blob = pdf.output('blob');
        
        pdf.save('test.pdf');
    })
},
/**
 * @description: Cut canvas * @param {number} num number of slices * @param {canvas} canvas 
 * @return {array} canvas list*/
splitCanvas(canvas,num){
    let height = canvas.height,width = canvas.width;
    let chunkHeight = height/num; // The height of each slice let chunkList = []; // Store the result canvas
    for(let i=0; i<height ; i+=chunkHeight){
        // Initialize the crop rectangle position let sx = 0,sy = i,sWidth = width,sHeight = chunkHeight,dx = 0, dy = 0;
        // Create a canvas node let canvasItem = document.createElement("canvas");
        // Initialize canvas size canvasItem.height = chunkHeight;
        canvasItem.width = width;
        let cxt = canvasItem.getContext("2d");
        // Put the cropped image into the new canvas node cxt.drawImage(canvas,sx,sy,sWidth,sHeight,dx,dy,sWidth,sHeight);
        chunkList.push(canvasItem); 
    }
    return chunkList;
},