Download slides from slideshare

slideshareDownload.js

function getHighestResImg(element) {
    if (element.getAttribute('srcset')) {
        let highResImgUrl = '';
        let maxRes = 0;
        let imgWidth, urlWidthArr;
        element.getAttribute('srcset').split(',').forEach((item) => {
            urlWidthArr = item.trim().split(' ');
            imgWidth = parseInt(urlWidthArr[1]);
            if (imgWidth > maxRes) {
                maxRes = imgWidth;
                highResImgUrl = urlWidthArr[0];
            }

        });

        return highResImgUrl;
    } else {
        return element.getAttribute('src');
    }

}

function get() {
    if (i >= num) {
        commands = ""
        for (let j = 0; j < num; j++) {
            commands += "wget " + lista[j] + ";\n";
        }
        commands += "convert `ls -1v|grep .jpg` file.pdf;"
        console.log(commands);
        return;
    }

    let curr = getHighestResImg(document.querySelectorAll(".slide-image")[i++]);
    lista.push(curr);
    setTimeout(get, 200);

}

function handle() {
    lista = [];
    num = document.querySelectorAll(".slide-image").length;
    for (let j = 1; j < num; j++) {
        document.querySelector("#next-slide").click();
    }
    for (let j = 1; j < num; j++) {
        document.querySelector("#previous-slide").click();
    }
    i = 0;
    setTimeout(get, 200);
}

handle();