html2canvas 页面截屏

$(document).ready(function () {
        $(".example1").on("click", function (event) {
            var width = $(".swiper-slide").width();
            var height = $(".swiper-slide").height();
            event.preventDefault();
            html2canvas($(".swiper-slide"), {
                allowTaint: true,
                taintTest: false,
                onrendered: function (canvas) {
                    canvas.id = "mycanvas";
                    //document.body.appendChild(canvas);
                    //生成base64图片数据
                    var dataUrl = canvas.toDataURL();
                    var newImg = document.createElement("img");
                    newImg.src = dataUrl;
                    document.body.appendChild(newImg);
                    //                    var image = canvas.toDataURL("image/png");
                    //                    var w = window.open('about:blank', 'image from canvas');
                    //                    w.document.write("<img src='" + image + "' alt='from canvas'/>");
                    //                    var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
                    //                    window.location.href = image;
                }, width: width * 2, height: height * 2
            });
        });