将图像从网站下载到桌面 [英] downloading image from website to desktop

问题描述

有人可以向我解释。为什么我的代码不工作？我已经改变了我的代码一遍又一遍，很难解释什么是不工作。所以我终于把它放在我的网站，所以我可以告诉你发生了什么。这里是我找到的代码：将div转换为单一图像canvas-javascript css 我使用这个例子，因为我想做同样的事情。我更改了图片，以便您可以在我的网站上查看 https://torcdesign.com/mom.php

  var download = document.getElementById（download），result = document .getElementById（result）; function renderContent（）{html2canvas（document.getElementById（content），{allowTaint：true}）。then（function（canvas）{result.appendChild（canvas）; download.style.display =inline;}）;} function downloadImage（）{download.href = result.children [0] .toDataURL（image / png）;} document.getElementById（button）。onclick = renderContent; onclick = downloadImage  

 < style> #content {position：绝对; width：300px; height：200px; border：5px solid red; overflow：hidden;}＃img1 {width：300px; height：200px; position：absolute; z-index：5;}＃img2 {position：absolute; z-index：6; width：150px; height：190px;}＃img3 {position：absolute; z-index：7; width：200px; height：100px;}＃下载{display：none;}< / style>  

 < script src =https://rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.min.js>< / script>< div id =content> ; < img id =img1src =https://torcdesign.com/shirts/brown.jpg> < img id =img2src =https://torcdesign.com/shirts/kiwi.jpg> < img id =img3src =https://torcdesign.com/shirts/lswhite.jpg> < / div>< br>< br>< br>< br>< br>< br>< br>< br>< br>< br>< br> ; br>< input id =buttontype =buttonvalue =convert div to image>< br>< h3> result：< / h3>< div id =result> ;< / div>< a id =downloaddownload =my_image.pnghref =＃>下载图片< / a>  

div>

解决方案

经过一番挖掘，看起来问题是你的画布是污点，导出一个污点画布。要确保画布不被污染，您不能使用跨原点图像。例如，我尝试使用base-64编码图像，而且那个工作完全正常。

Can someone please explain to me. Why my this code is not working? I have changed my code over and over and its hard to explain what is not working. So i finally put it in my website so I can show you what is going on. Here is where i found the code: convert div to single image with canvas-javascript css I use this an example because I'm trying to do the same thing. I changed the images so you can see on my site https://torcdesign.com/mom.php

var download = document.getElementById("download"),
		result = document.getElementById("result");

function renderContent() {
    html2canvas(document.getElementById("content"), {
        allowTaint: true
    }).then(function(canvas) {
    		result.appendChild(canvas);
        download.style.display = "inline";
    });
}

function downloadImage() {
		download.href = result.children[0].toDataURL("image/png");
}

document.getElementById("button").onclick = renderContent;
download.onclick = downloadImage

<style>
#content {
    position: absolute;
    width: 300px;
    height: 200px;
    border: 5px solid red;
    overflow: hidden;
}

#img1 {
    width: 300px;
    height: 200px;
    position: absolute;
    z-index: 5;
}

#img2 {
    position: absolute;
    z-index: 6;

    width: 150px;
    height: 190px;
}

#img3 {
    position: absolute;
    z-index: 7;
    width: 200px;
    height: 100px;
}

#download {
    display: none;
}
</style>

<script src="https://rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.min.js"></script>

<div id="content">
    <img id="img1" src="https://torcdesign.com/shirts/brown.jpg">
    <img id="img2" src="https://torcdesign.com/shirts/kiwi.jpg">
    <img id="img3" src="https://torcdesign.com/shirts/lswhite.jpg">   
</div>
<br><br><br><br><br><br><br><br><br><br><br><br>
<input id="button" type="button" value="convert div to image"><br>
<h3>result:</h3>
<div id="result"></div>
<a id="download" download="my_image.png" href="#">Download image</a>

解决方案

After some digging, it looks like the issue is that your canvas is tainted, and you cannot export a tainted canvas. To make sure you canvas is not tainted, you cannot use cross-origin images. For example, I tried using a base-64 encoded image instead, and that one worked perfectly fine.

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