html2canvas 不呈现图像（外部托管的图像）

Question

我创建了一个游戏，其中用户从 4 个单独的幻灯片中选择 4 个图像来创建一个合成图像，然后我希望能够将其导出到我网站上的“图库”功能。我正在尝试使用 html2canvas 但遇到了一些问题

这是我的jQuery：

var shotit = function() {
$('.bodyWrap').html2canvas({
onrendered : function(canvas) {
var img = canvas.toDataURL();
    $('<img>',{src:img}).appendTo($('body'));
        }
    }); }

body wrap 是一个非常长的 html 元素，里面有很多子元素，但它基本上是这样的

<div class="bodyWrap">

        <div class="header">
          <h1>TITLE</h1>
        </div>

            <div class="slideshowWrapper">
              <div class="slideshow">
                    <div class="slideshowWrapper">
                <div class="slideshow">
                    <div class="slide">
                       <img class="img2" src="https://i.imgur.com/mnJDmlS.jpg" alt="head1">
<div class="emailButton">
 <a class="emailLink" href="mailto:emailaddres@email.com?Subject=Let's mail"target="_blank"><br>Name of Artist</a>
</div>
                    </div>
                    <div class="slide">
                        <img https://picture.jpg>
                    </div>
                      <div class="prevControl"></div>
                      <div class="nextControl"></div>
              <div class="slideshow">
                    <div class="slide">
                        <img https://picture.jpg>
                    </div>
                    <div class="slide">
                        <img https://picture.jpg>
                    </div>
                      <div class="prevControl"></div>
                      <div class="nextControl"></div>
              <div class="slideshow">
                    <div class="slide">
                        <img https://picture.jpg>
                    </div>
                    <div class="slide">
                        <img https://picture.jpg>
                    </div>
                      <div class="prevControl"></div>
                      <div class="nextControl"></div>
              <div class="slideshow">
                  <div class="slide">
                        <img https://picture.jpg>
                  </div>
                  <div class="slide">
                        <img https://picture.jpg>
                  </div>
                      <div class="prevControl"></div>
                      <div class="nextControl"></div>
                  </div>
              </div>
            </div>
</div>

图像托管在外部 imgur 上，而不是我的网站上。

然后是一个看起来像这样的按钮（用于拍照）

<a href="#" onClick="shotit()">take picture</a>

抱歉，代码可能有点多，但我不知道问题出在哪里！！

无论如何，感谢收到任何帮助或指点！谢谢

Answer 1

您可以通过在 html2canvas 函数中传递选项之一来实现。

html2canvas(document.body,
{
useCORS: true, //By passing this option in function Cross origin images will be rendered properly in the downloaded version of the PDF
onrendered: function (canvas) {
 //your functions here
}
});

Answer 2

尝试这个：

<div class="bodyWrap">
  <div class="header">
    <h1>TITLE</h1>
  </div>
  <div class="slideshowWrapper">
    <div class="slideshow">
      <div class="slide">
        <img src="https://picture.jpg">
      </div>
      <div class="slide">
        <img src="https://picture.jpg">
      </div>
      <div class="prevControl"></div>
      <div class="nextControl"></div>
      <div class="slideshow">
        <div class="slide">
          <img src="https://picture.jpg">
        </div>
        <div class="slide">
          <img src="https://picture.jpg">
        </div>
        <div class="prevControl"></div>
        <div class="nextControl"></div>
        <div class="slideshow">
          <div class="slide">
            <img src="https://picture.jpg">
          </div>
          <div class="slide">
            <img src="https://picture.jpg">
          </div>
          <div class="prevControl"></div>
          <div class="nextControl"></div>
          <div class="slideshow">
            <div class="slide">
              <img src="https://picture.jpg">
            </div>
            <div class="slide">
              <img src="https://picture.jpg">
            </div>
            <div class="prevControl"></div>
            <div class="nextControl"></div>
          </div>
        </div>
      </div>
    </div>
    <a href="#" onClick="shotit(event)">take picture</a>
    <script src="jquery-2.1.1.min.js"></script>
    <script src="html2canvas.js"></script>
    <script>
      var shotit = function(e)
      {
        e.preventDefault();
        html2canvas($('.bodyWrap'), {
          onrendered: function(canvas)
          {
            document.body.appendChild(canvas);
          },
          logging:true
        });
      };
    </script>