如何将图像放置在画布后面

Question

I'm in the final stretch of the game and when I put the background image, it overlaps the Canvas, how do I fix this? - Google translator

game

game with background

Answer 1

将图像作为包含画布的元素的 css 背景图像，或者使用比画布小的 z-index 值使图像成为绝对图像

Answer 2

You can make use of drawImage property of canvas

 var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); var background = new Image(); background.src = "https://cdn0.iconfinder.com/data/icons/is_google_plus_one_icons/256/google_plus_one_-plus-1_canvas.png"; background.onload = function(){ ctx.drawImage(background,0,0, 200, 100); ctx.moveTo(0,0); ctx.lineTo(200,100); ctx.stroke(); }

 <canvas id="myCanvas" width="200" height="100" style="border:1px solid #d3d3d3;">

Make use of onload property of image to draw the canvas contents.