如何将此屏幕截图保存在本地驱动器中而不弹出任何窗口？

Question

我想将此屏幕截图保存在本地驱动器中而不显示要下载的弹出窗口。

    (function() {
        'use strict';
        $("body").prepend ( `
    <button id="btCapture">SCREENSHOT</button>
    <input type="submit" value="Take Screenshot Of Div" onclick="capture();" />
    <form method="POST" enctype="multipart/form-data" action="save.php" id="myForm">
    <input type="hidden" name="img_val" id="img_val" value="" />
    </form>
    <div></div>`);

    document.getElementById("btCapture").onclick = function() { generate();};
        (function (exports) {
            function urlsToAbsolute(nodeList) {
                if (!nodeList.length) {
                    return [];
                }
                var attrName = 'href';
                if (nodeList[0].prototype === HTMLImageElement.prototype || nodeList[0].protottype === HTMLScriptElement.prototype) {
                    attrName = 'src';
                }
                nodeList = [].map.call(nodeList, function (el, i) {
                    var attr = el.getAttribute(attrName);
                    if (!attr) {
                        return;
                    }
                    var absURL = /^(https?|data):/i.test(attr);
                    if (absURL) {
                        return el;
                    } else {
                        return el;
                    }
                });
                return nodeList;
            }

            function screenshotPage() {
                urlsToAbsolute(document.images);
                urlsToAbsolute(document.querySelectorAll("link[rel='stylesheet']"));
                var screenshot = document.documentElement.cloneNode(true);
                var b = document.createElement('base');
                b.href = document.location.protocol + '//' + location.host;
                var head = screenshot.querySelector('head');
                head.insertBefore(b, head.firstChild);
                screenshot.style.pointerEvents = 'none';
                screenshot.style.overflow = 'hidden';
                screenshot.style.webkitUserSelect = 'none';
                screenshot.style.mozUserSelect = 'none';
                screenshot.style.msUserSelect = 'none';
                screenshot.style.oUserSelect = 'none';
                screenshot.style.userSelect = 'none';
                screenshot.dataset.scrollX = window.scrollX;
                screenshot.dataset.scrollY = window.scrollY;
                var script = document.createElement('script');
                script.textContent = '(' + addOnPageLoad_.toString() + ')();';
                screenshot.querySelector('body').appendChild(script);
                var blob = new Blob([screenshot.outerHTML], {
                    type: 'text/html'
                });
                return blob;
            }

            function addOnPageLoad_() {
                window.addEventListener('DOMContentLoaded', function (e) {
                    var scrollX = document.documentElement.dataset.scrollX || 0;
                    var scrollY = document.documentElement.dataset.scrollY || 0;
                    window.scrollTo(scrollX, scrollY);
                });
            }

            function generate() {
                window.URL = window.URL || window.webkitURL;
                window.open(window.URL.createObjectURL(screenshotPage()));
            }
            exports.screenshotPage = screenshotPage;
            exports.generate = generate;
        })(window);
    })

;

Answer 1

你不能。 允许网页将文件写入最终用户机器上的任意路径将是恶意软件利用的一个巨大漏洞。 用户必须参与。