在kanvas中实现touch事件
2017-06-14 本文已影响0人
璃_b11f
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<title>画画板系统</title>
<style>
body{
margin:0;
}
canvas{
background:#eee;
}
</style>
</head>
<body>
<canvas id="mycanvas"></canvas>
<script>
var canvas = document.querySelector("#mycanvas");
canvas.width = window.innerWidth;
canvas.height = 500;
//获取绘图环境
var cxt = canvas.getContext("2d");
//绑定触摸事件
canvas.addEventListener("touchstart", function(e){
cxt.beginPath();
cxt.moveTo(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
canvas.addEventListener("touchmove", function(e){
cxt.lineTo(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
cxt.stroke();
})
})
</script>
</body>
</html>
