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javascript - 绘制 Canvas 不工作

转载 作者:行者123 更新时间:2023-11-28 07:48:57 26 4
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I'm trying to Draw a Canvas using JavaScript ... but it's not working .. Can anybody help me on this? ..I'm trying to Build a Flappy bird with HTML 5 and JavaScript .. but this Code is not Working ..

Pastebin Code: http://pastebin.com/uEXVx89k

    <!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">

<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="mobile-web-app-capable" content="yes">

<title>FlappyJS</title>

<script src="sprite.js"></script>

<style>
canvas {
display: block;
position: absolute;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
</style>
</head>
<body>
<script type="text/javascript" src="sprite.js"></script>
<script>

var canvas,
ctx,
width,
height,

frames = 0,
score = 0,
best = 0,

currentstate,
states = {

Splash:0 , Game: 1 ,Score:2
},

bird = {},
pipes = {};

function main(){

canvas = document.createElement("canvas");
width = window.innerWidth;
heigth = window.innerHeight;


if (width >= 500) {
width = 320;
heigth = 480;
canvas.style.border = "1px solid #000";
}

canvas.width = width;
canvas.height = height;
ctx = canvas.getContext("2d");

document.body.appendChild(canvas);



}

function run(){

}
function update(){

}
function render(){


}

main();

</script>
</body>
</html>

Note: I'm a Noob in JavaScript .

我需要绘制一个 Canvas ,如图 enter image description here

最佳答案

这是一个正在运行的 JSFiddle:http://jsfiddle.net/jwmnvn04/

您有一个拼写错误。

首先你这样声明:

heigth      = window.innerHeight; 

然后(我猜仍然正确,尽管上下文拼写错误):

  heigth = 480;

但是当你调用它来确定 Canvas 的高度时,你可以正确拼写它:

  canvas.height   = height;

关于javascript - 绘制 Canvas 不工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27088485/

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