html2canvas不会在下载中包含css背景图像

Question

所以我使用HTML2画布生成一个社交媒体图像。

我遇到的问题是它不包括css背景图像。

在检查了其他关于堆栈溢出的帖子后，似乎没有一个解决方案起作用，版本是最新的，即使使用相同的原始图像也不会起作用。我做错了什么？

此处的代码笔链接

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>

Answer 1

更改此项以获得背景图像：

html2canvas(document.querySelector(".quote"),{
allowTaint: true,
useCORS: true
}).then(canvas => {

如果对你有帮助，请告诉我。