canvas 画板

<!DOCTYPE html>

<html>

	<head>

		<meta charset="utf-8" />

		<title></title>

		<link rel="stylesheet" type="text/css" href="css/main.css"/>

	</head>

	<body>

		<div class="container">

			<p id="message"></p>

			<div class="cvs-wrap">

				<canvas id="cvs" width="600" height="400"></canvas>

			</div>

			<div class="pencolor" id="pencolor">

				<ul>

					<li style="background: #000000;">黑</li>

					<li style="background: #ffffff;">白</li>

					<li style="background: #FF0000;">红</li>

					<li style="background: #FF8C00;">橙</li>

					<li style="background: #EEEE00;">黄</li>

					<li style="background: #7FFF00;">绿</li>

					<li style="background: #0000AA;">蓝</li>

					<li style="background: #00EE76;">青</li>

					<li style="background: #8B4789;">紫</li>

					<li onclick="clearimg()">清除</li>

				</ul>

			</div>

			<div class="pensize" id="pensize">

				<ul>

					<li style="font-size: 1px;">1</li>

					<li style="font-size: 2px;">2</li>

					<li style="font-size: 3px;">3</li>

					<li style="font-size: 4px;">4</li>

					<li style="font-size: 5px;">5</li>

					<li style="font-size: 6px;">6</li>

					<li style="font-size: 7px;">7</li>

					<li style="font-size: 8px;">8</li>

					<li style="font-size: 9px;">9</li>

					<li style="font-size: 16px;">保存</li>

				</ul>

			</div>

		</div>

		<script type="text/javascript" src="js/main.js"></script>

	</body>

</html>

*{margin: 0;padding: 0;}

.container{width: 600px; height: 502px; margin: 0 auto;border: 1px solid #ff0000;}

.cvs-wrap{width: 600px;height: 400px;}

.pencolor{width: 600px;height: 50px;border-top: 1px solid #e7e7e7;}

.pensize{width: 600px;height: 50px;border-top: 1px solid #e7e7e7;}

.pencolor li,.pensize li{float: left;list-style: none; width: 60px;height: 50px;text-align: center;line-height: 50px; display: block;}

window.onload = function() {

	var active = false;

	//	console.log(pencolor) ;

	//	console.log(pensize) ;

	var canvas = document.getElementById("cvs");

	var pencolor = document.getElementById('pencolor').getElementsByTagName('li');

	var pensize = document.getElementById('pensize').getElementsByTagName('li');

	var cxt = canvas.getContext("2d");

	canvas.onmousedown = function(event) {

		active = true;

		//获取x

		x = event.clientX - canvas.offsetLeft;

		//获取y

		y = event.clientY - canvas.offsetTop;

		//		console.log(x, y);

	}

	canvas.onmousemove = function(event) {

		if(active == true) {

			//获取x

			x2 = event.clientX - canvas.offsetLeft;

			//获取y

			y2 = event.clientY - canvas.offsetTop;

			console.log(x2, y2, active);

			cxt.beginPath();

			cxt.moveTo(x, y);

			cxt.lineTo(x2, y2);

			cxt.strokeStyle = color;

			cxt.lineWidth =size;

			cxt.lineCap="round";

			cxt.stroke();

			cxt.closePath();

			x = x2;

			y = y2;

		}

	}

	canvas.onmouseup = function() {

		active = false;

	}

	for(var i = 0; i < pencolor.length; i++) {

		var color="rgb(0,0,0)";

		pencolor[i].onclick = function() {

			//		console.log(pencolor);

			color = this.style.backgroundColor;

			//		console.log(color);

			return color;

			alert(color);

		}

	}

	for(var j = 0; j < pencolor.length; j++) {

		var size="1px";

		pensize[j].onclick = function() {

			//		console.log(pencolor);

			size = this.innerHTML;

			//		console.log(size);

			return size;

			console.log(size);

		}

	}

}

　　 canvas 画板

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