html5 canvas简单的直线路径

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>简单直线路径</title>

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

</head>

<body>

<script type="text/javascript">

window.addEventListener('load',eventWindowLoaded,false);

function eventWindowLoaded(){

	canvasApp();

}

function canvasSupport(){

	return Modernizr.canvas;

}

function canvasApp(){

	if(!canvasSupport()){

		return;

	}else{

		var theCanvas = document.getElementById('canvas')

		var context = theCanvas.getContext("2d")

	}

	drawScreen();

    function drawScreen(){

	context.strokeStyle='#ff00ff'

	context.lineWidth=10;

        context.lineGap='square';

        context.beginPath();

        context.moveTo(20,0);

        context.lineTo(100,0);

        context.stroke();

        context.closePath();

}

}

</script>

<canvas id="canvas" width="500" height="500">

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</canvas>

</body>

</html>