HTML5 canvas 在线涂鸦

插件地址

http://bencentra.github.io/jq-signature/

采用技术

jq-signature.min.js
Developed using jQuery 2.1.4.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="jquery.min.js"></script>
<script src="jq-signature.min.js"></script>
<script>
	$(function(){
		$('.js-signature').jqSignature();
	})
	function clearCanvas() {
		$('#signature').html('<p><em>Your signature will appear here when you click "Save Signature"</em></p>');
		$('.js-signature').eq(1).jqSignature('clearCanvas');
		$('#saveBtn').attr('disabled', true);
	}

	function saveSignature() {
		$('#signature').empty();
		var dataUrl = $('.js-signature').jqSignature('getDataURL');
		var img = $('<img>').attr('src', dataUrl);
		$('#signature').append($('<p>').text("Here's your signature:"));
		$('#signature').append(img);
	}

	$('.js-signature').eq(1).on('jq.signature.changed', function() {
		$('#saveBtn').attr('disabled', false);
	});
</script>
</head>
<body>
<div class="js-signature" data-width="600" data-height="200" data-border="1px solid black" data-line-color="#bc0000" data-auto-fit="true"></div>
			<p><button id="clearBtn" class="btn btn-default" onclick="clearCanvas();">Clear Canvas</button> 
			<button id="saveBtn" class="btn btn-default" onclick="saveSignature();" >Save Signature</button></p>
<div id="signature">
				<p><em>Your signature will appear here when you click "Save Signature"</em></p>
			</div>
</body>
</html>