jQuery 背景 Canvas 透明度

Question

我正在使用 jQuery Background Canvas插件并创建了一个带有圆 Angular 和渐变效果的 DIV。但是，我无法让透明度发挥作用。我究竟做错了什么？这是 JavaScript:

$(document).ready(function()
{
$(".Test").backgroundCanvas();
$(".Test").makeElementTransparent("#CECFCE");
$(".Test").backgroundCanvas(true, "#CECFCE");
});

function DrawBackground() {
$(".Test").backgroundCanvasPaint(TestBackgroundPaintFkt);
}
// Draw the background on load and resize
$(window).load(function () { DrawBackground(); });
$(window).resize(function() { DrawBackground(); });

function TestBackgroundPaintFkt(context, width, height, elementInfo)
{
var options = {x:0, height: height, width: width,
radius:7, border: 0 };
// Draw the red border rectangle
context.fillStyle = "#CECFC6";
$.canvasPaint.roundedRect(context,options);
// Draw the gradient filled inner rectangle
var backgroundGradient = context.createLinearGradient(0, 0,
0, height - 10);
backgroundGradient.addColorStop(0 ,'#F7F7EF');
backgroundGradient.addColorStop(1, '#CECFCE');
options.border = 1;
context.fillStyle = backgroundGradient;
$.canvasPaint.roundedRect(context,options);
}

元素本身看起来像这样:

<div class="Test">
   something here
</div>

这是它的 CSS:

.Test {
    width: 300px;
    height: 300px;
}

Answer 1

我遇到了同样的问题。就我而言，以下行起到了作用:

$('#*[canvasId]*').css('background-color','transparent');