Html2Canvas把div保存图片的示例都有什么？

var w = $("#code").width();
var h = $("#code").height();

//要将 canvas 的宽高设置成容器宽高的 2 倍
var canvas = document.createElement("canvas");
canvas.width = w * 2;
canvas.height = h * 2;
canvas.style.width = w + "px";
canvas.style.height = h + "px";
var context = canvas.getContext("2d");
//然后将画布缩放，将图像放大两倍画到画布上
context.scale(2,2);

html2canvas(document.querySelector("#code"), {
  canvas: canvas,
  onrendered: function(canvas) {
    ...
  }
});

.on('click','.download',function(){
        $('#mycanvas').remove();
        var _height=$('.skinReport').height();
        //滚到顶部
        $('html, body').animate({scrollTop:0});

        if(confirm('是否下载肌肤检测报告？'))
        {

          setTimeout(function(){
            var canvas = document.createElement("canvas"),
              w=$('#skinReport').width(),
              h=$('#skinReport').height();
            canvas.width = w * 2;
            canvas.height = h * 2;
            canvas.style.width = w + "px";
            canvas.style.height = h + "px";
            var context = canvas.getContext("2d");
//然后将画布缩放，将图像放大两倍画到画布上
            context.scale(2,2);
            html2canvas(document.getElementById('skinReport'), {
              allowTaint: false,
              taintTest: true,
              canvas: canvas,
              onrendered: function(canvas) {
                canvas.id = "mycanvas";
                canvas.style.display = 'none';
                document.body.appendChild(canvas);
                //生成base64图片数据

                imgData = canvas.toDataURL(type);
                //var newImg = document.createElement("img");
                //newImg.src = dataUrl;
                //document.body.appendChild(newImg);
                //console.log(imgData);

                var _fixType = function(type) {
                  type = type.toLowerCase().replace(/jpg/i, 'jpeg');
                  var r = type.match(/png|jpeg|bmp|gif/)[0];
                  return 'image/' + r;
                };
                // 加工image data，替换mime type
                imgData = imgData.replace(_fixType(type),'image/octet-stream');
                /**
                 * 在本地进行文件保存
                 * @param {String} data   要保存到本地的图片数据
                 * @param {String} filename 文件名
                 */
                var saveFile = function(data, filename){
                  var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
                  save_link.href = data;
                  save_link.download = filename;

                  var event = document.createEvent('MouseEvents');
                  event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
                  save_link.dispatchEvent(event);
                };

                // 下载后的问题名
                var filename = aname+'肌肤检测报告' + (new Date()).getTime() + '.' + type;
                // download
                saveFile(imgData,filename);
              },
              width:1512,
              height:15000
            })
          },2500)
        }
        else
        {
          return;
        }

      })