使用图层(zIndex)在画布中设置背景 [英] Set the background in canvas using layer (zIndex)

问题描述

我需要使用图层在画布上获取背景.它的背景是可变的.我知道我应该使用CSS并设置z-index，但是在这种情况下不知道该怎么做.

I need to get a background on canvas using layers. Variable for it's background. I know I should use CSS and set the z-index, but do not know how to do it in this case.

JS:

function doFirst(){
var x = document.getElementById('canvas');
canvas = x.getContext('2d');

var item1 = new Image();
item1.src = "images/sheep.png";
item1.addEventListener("load", function() { canvas.drawImage(item1,20,300)}, false);

var item2 = new Image();
item2.src = "images/tshirt.png";
item2.addEventListener("load", function() { canvas.drawImage(item2,300,300)}, false);

var background = new Image();
background.src = "images/background.png";
background.addEventListener("load", function() {       canvas.drawImage(background,0,0,1024,768)}, false);
}

HTML:

<canvas id="canvas" width="1024" height="768"> 

推荐答案

Canvas元素并非旨在解决该元素中的图层，您需要使用多个canvas元素来解决问题.

The Canvas element is not designed to address layers within the element, you'll need to approach your problem using multiple canvas elements instead.

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