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demo12.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>canvas</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>
</head>
<body>
<h1>写字板</h1>
<canvas id="canvas" style="border:1px solid #ccc; margin: 50px auto;display: block;" height="768" width="1024">
如果浏览器不支持canvas的话则会显示这行文字
</canvas>
<script type="text/javascript">
window.onload= function(){
var canvas = document.getElementById("canvas");
var canvastext = canvas.getContext("2d");
// canvastext.lineWidth = 5;
// canvastext.strokeStyle = "#abc";
canvas.onmousedown=function(even){
var x = even.pageX-this.offsetLeft;
var y = even.pageY-this.offsetTop;
canvastext.beginPath()
canvastext.lineWidth = 1
canvastext.strokeStyle = "#abc" // 边框颜色
canvastext.moveTo(x,y)
canvas.addEventListener("mousemove" , onmousemove , false);
}
canvas.onmouseup=function(even){
canvas.removeEventListener("mousemove" , onmousemove , false);
}
function onmousemove(even){
var x1 = even.pageX-this.offsetLeft;
var y1 = even.pageY-this.offsetTop;
canvastext.lineTo(x1,y1);
canvastext.stroke();
}
}
</script>
</body>
</html>