4.2 HTML Canvas标签

1. Canvas画布  通常用js来描绘

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Canvas</title>
    <script src="myjavascript.js"></script>
</head>
<body>
</body>
</html>
var CANVAS_WIDTH = 200;
var CANVAS_HEIGHT = 200;
var myCanvas;
var myContext;

window.onload = function () {
    createCanvas();
    drawRect();
}

function createCanvas(){
    document.body.innerHTML = "<canvas id=\"mycanvas\" width=\"" + CANVAS_WIDTH
                                + "\" height=\"" + CANVAS_HEIGHT + "\" ></canvas>";
    myCanvas = document.getElementById("mycanvas");
    myContext = myCanvas.getContext("2d");
}

function drawRect(){
    myContext.fillRect(0,0,200,200);
}

 

posted @ 2015-02-13 16:16  Mirrorhanman  阅读(109)  评论(0)  编辑  收藏  举报