我有一个网页,它在CANVAS元素中显示图像,该元素是 DIV 元素的子元素。我希望能够从CANVAS元素中抓取图像并将其放入我将在屏幕上移动的 DIV 中。我正在使用下面的代码来尝试执行此操作。Javascript 代码使用 JQuery CSS() 方法将封装在“url()”方法调用中的canvas.toDataURL()方法的值分配给DIV的背景图像。我检查了 Chrome 调试器控制台,并将 DIV的backround -image属性设置为canvas.toDataURL()方法返回的值。我可以在backgroundImage中看到它列为 DIV 的Style属性的子项的字段。但是,如果我将 Watch 表达式设置为$("#easter-egg-cat-1").css("backround-image")它会返回“none”作为值。
在任何情况下,我都看不到 DIV 中的背景图像。为什么会这样,我该如何解决?
<!-- THESE ARE THE WEB PAGE ELEMENTS INVOLVED -->
<div id="viewer-container">
<!-- This DIV is where any warning messages will be displayed if a cat's face can not be
detected properly in the uploaded photo. -->
<div class="kittydar-viewer" id="kittydar-viewer"></div>
<div id="viewer">
<canvas id="preview">
</canvas>
<canvas id="annotations">
</canvas>
</div>
<!-- This is where progress messages from the KittyDar detector are displayed as it searches for a cat face in the uploaded picture. -->
<div class="kittydar-progress" id="kittydar-progress">(none)</div>
</div>
// This is the script that grabs the image from the CANVAS element and sets the
// the desired DIVs background-image CSS property to the URL provided by the
// CANVAS element.
var previewCanvasAsUrl = $("#preview").get(0).toDataURL();
$("#easter-egg-cat-1").css("backround-image", "url(" + previewCanvasAsUrl + ")");