因此，我使用HTML 2画布生成一个社会媒体图像.
我的问题是，它不包括css的背景图像。
检查了堆栈溢出的其他帖子，没有一个解决方案似乎工作，版本是最新的，这不会工作，即使是相同的起源图像。我错了什么？
Codepen link here

function getCapture(){
  html2canvas(document.querySelector(".quote")).then(canvas => {
    
    var quote = document.querySelector(".quote");

    document.body.appendChild(canvas);

    var download = document.getElementById("download");
    var image = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
    download.setAttribute("href", image);
    download.setAttribute("download","quote.png");

    download.click();

  });
}

$(function(){
  
  $('.generator [name="author"]').keyup(function(){
    var author = $(this).val();
    $('.quote .text small').html('⚊ ' + author);
  });
  
  $('.generator [name="quote"]').keyup(function(){
    var quote = $(this).val();
    $('.quote .text p').html(quote);
  });
  
  $('.generator [name="image"]').on('change', function(){
  
    var input = this;
    var url = $(this).val();
    var ext = url.substring(url.lastIndexOf('.') + 1).toLowerCase();
    if (input.files && input.files[0]&& (ext == "gif" || ext == "png" || ext == "jpeg" || ext == "jpg")) 
     {
        var reader = new FileReader();
        reader.onload = function (e) {
           $('.quote img').attr('src', e.target.result);
        }
       reader.readAsDataURL(input.files[0]);
    }else{
      $('.quote img').attr('src', '');
    }
    
  });
  
});

body{
  background: #152C46;
}

body{
  font-family: 'Manrope';
  font-weight: 400;
}

.quote{
  display: block;
  position: relative;
  /*
  top: 50%;
  transform: translateY(-50%);
  */
  width: 1200px;
  height: 628px;
  overflow: hidden;
  margin: 0 auto;
  margin-top: 5%;
  box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
   background-image: url("https://i.imgur.com/DVJHJnR.png");
  background-size: 700px;
  background-repeat: no-repeat;
  background-position: top left;
  background-color: white;
}
.bg-img img {
  float: left; 
  top: 0;
  position: absolute;
}
.quote .image{
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100%;
  z-index: 1;
  text-align: center
}
.quote .image img{
  display: inline-block;
  width: 160px;
  height: 160px;
  vertical-align: middle;
  margin-top: 15%;
  opacity: 1;
  border-radius: 50%;
  object-fit:cover;
}
.quote .overlay{
  position: absolute;
  width: 97%;
  height: 97%;
  top: 1.5%;
  left: 1.5%;
  z-index: 2;
  border: solid 5px #fff
}
.quote .overlay:after{
  content: '❝';
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  display: block;
  color: #152C46;
  line-height: .9;
  font-size: 40em;
  font-weight: 600;
  opacity: .12;
}
.quote .content{
  position: absolute;
  width: 80%;
  height: 80%;
  top: 30%;
  left: 10%;
  z-index: 4;
  text-align: center;
}
.quote .content .text{
  position: relative;
  top: 50%;
  transform: translateY(-50%);
  color: #152C46;
}
.quote .content .text > *{word-break: break-word}
.quote .content .text p{
  font-size: 2.7em;
  font-weight: 200
}
.quote .content .text small{
  font-size: .9em;
  font-weight: 700;
  color: #152C46;
  letter-spacing: .01em;
}

.generator{
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 250px;
  height: 100%;
  background: rgba(255,255,255,1);
  padding: 25px;
  box-shadow: 0 20px 15px 15px rgba(0,0,0,.2);
  z-index: 5
}
.generator .generator-inner{
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}
.generator h3{
  font-weight: 700;
  margin-bottom: 20px
}
.generator .btn{
  border: 0 none;
  background-color: #FF3CAC;
}
canvas{display: none}

<link href="https://cdn.materialdesignicons.com/2.1.99/css/materialdesignicons.min.css" rel="stylesheet"/>
<link href="https://getbootstrap.com/docs/4.1/dist/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.4/popper.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.2/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-compat/3.0.0-alpha1/jquery.min.js"></script>
<div class="quote">
  <div class="image">
    <img src="https://placeimg.com/500/500/arch/sepia" alt="">
  </div>
<!--   <div class="overlay"></div> -->
  <div class="content">
    <div class="text">
      <p>Love all, trust a few, do wrong to none.</p>
      <small> William Shakespeare</small>
    </div>
      
  </div>
</div>

<div class="generator">
  <div class="generator-inner">
    
    <h3>Generator</h3>

    <div class="form-group">
      <label for="quote">Quote</label>
      <textarea type="text" class="form-control" maxlength="200" name="quote" required>Love all, trust a few, do wrong to none.</textarea>
    </div>

    <div class="form-group">
      <label for="author">Author</label>
      <input type="text" class="form-control" name="author" value="William Shakespeare" required>
    </div>

    <div class="form-group">
      <label for="image">Image</label>
      <input type="file" class="form-control" name="image" accept="image/x-png,image/gif,image/jpeg">
    </div>

    <div class="form-group">
      <a href="javascript:getCapture();" class="btn btn-block btn-secondary">DOWNLOAD</a>
      <a href="javascript:" id="download" style="display: none"></a>
    </div>
    
  </div>     
</div>