<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
<style>
#canvas {
background: white;
height: 300px;
width: 300px;
}
</style>
</head>
<body>
<canvas id="canvas">
</canvas>
<input type="button" class="but1" value="重新签名" />
<input type="button" class="but2" value="提交签名" />
<img id="sigimg" src="" />
<script>
var canvas = document.getElementById("canvas");
//动态设置宽高
canvas.width = 400;
canvas.height = 300;
var content = canvas.getContext("2d");
//设置画笔的样式
content.strokeStyle = "#000";
content.lineWidth = 1;
content.lineCap = 'round';
content.lineJoin = 'round';
content.shadowBlur = 1;
content.shadowColor = '#000';
content.beginPath();
//点击
canvas.addEventListener("touchstart", function(e) {
content.beginPath();
var touch = e.targetTouches[0];
var x = touch.pageX - canvas.offsetLeft;
var y = touch.pageY - canvas.offsetTop;
content.moveTo(x, y);
});
//移动
canvas.addEventListener("touchmove", function(event) {
event.preventDefault();
var touch = event.targetTouches[0];
var x = touch.pageX - canvas.offsetLeft;
var y = touch.pageY - canvas.offsetTop;
content.lineTo(x, y);
content.stroke();
});
//结束
canvas.addEventListener("touchend", function(event) {
content.closePath();
$('.but2').attr('disabled', false);
});
//清除画布 .but1元素 点击事件
document.querySelector(".but1").onclick = function() {
content.clearRect(0, 0, canvas.offsetWidth, canvas.offsetHeight);
}
document.querySelector(".but2").onclick = function() {
var data = canvas.toDataURL('image/png');
$('#sigimg').attr('src', data);
}
</script>
</body>
</html>
网友回复
我知道答案，我要回答
私活外包
最新提问
python如何调用openai的api实现知识讲解类动画讲解视频的合成？
html如何直接调用openai的api实现海报可视化设计及文本描述生成可编辑海报？
f12前端调试如何找出按钮点击事件触发的那段代码进行调试？
abcjs如何将曲谱播放后导出mid和wav格式音频下载？
python如何将曲子文本生成音乐mp3或wav、mid文件
python中mp3、wav音乐如何转成mid格式？
js在HTML中如何将曲谱生成音乐在线播放并下载本地？
python如何实现在windows上通过键盘来模拟鼠标操作？
python如何给win10电脑增加文件或文件夹右键自定义菜单？
python如何将音乐mp3文件解析获取曲调数据？
