<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>canvas</title>
<script type="text/javascript" src="../js/jQuery.js"></script>
<style type="text/css">
*{
margin: 0;
padding: 0;
outline: none;
border: none;
}
#canvas{
margin: auto auto;
width: 7rem;
margin: .25rem 0 0 1.5rem;
border: 1px solid black;
}
</style>
</head>
<body>
<canvas id="canvas" width="1000" height="600"></canvas>
</body>
</html>
<script type="text/javascript">
/**
* rem 布局初始化
*/
$('html').css('font-size', $(window).width()/10);
/**
* 获取 canvas 画布
* 获取 canvas 绘图上下文环境
*/
var canvas = $('#canvas')[0];
var cxt = canvas.getContext('2d');
/**
* 线条顶点的样式
*/
cxt.lineWidth = 40;
cxt.strokeStyle = 'red';
cxt.beginPath();
cxt.moveTo(100, 100);
cxt.lineTo(800, 300);
cxt.lineCap = "butt"; //线段端点的样式
cxt.stroke();
cxt.beginPath();
cxt.moveTo(100, 200);
cxt.lineTo(800, 400);
cxt.lineCap = "round"; //线段端点的样式
cxt.stroke();
cxt.beginPath();
cxt.moveTo(100, 300);
cxt.lineTo(800, 500);
cxt.lineCap = "square"; //线段端点的样式
cxt.stroke();
</script>