问更改appendChild函数

EN

// JavaScript Document
function decode() {
    // The Base64 string of a simple PDF file
    var b64decode = BASE64 STRING

    // Decode Base64 to binary and show some information about the PDF file (note that I skipped all checks)
    var bin = atob(b64decode);


    // Embed the PDF into the HTML page and show it to the user
    var obj = document.createElement('object');
    obj.style.width = '100%';
    obj.style.height = '842pt';
    obj.type = 'application/pdf';
    obj.data = 'data:application/pdf;base64,' + b64decode;
    document.body.appendChild(obj);

    // Insert a link that allows the user to download the PDF file
    var link = document.createElement('a');
    link.innerHTML = 'Download PDF file';
    link.download = 'file.pdf';
    link.href = 'data:application/octet-stream;base64,' + b64decode;
    document.body.appendChild(link);
}