<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<canvas id="canvas" style="margin:0 auto;">
The current browser does not support Canvas, can replace the browser a try!
</canvas>
<script>
window.onload = function(){
var canvas = document.getElementById('canvas');
canvas.width = 1024;
canvas.height = 768;
if(canvas.getContext('2d')){
var context = canvas.getContext('2d');
context.lineWidth = 10 ;
context.strokeStyle = "#005588" ;
context.beginPath();
context.moveTo(100,200);
context.lineTo(700,200);
context.lineCap = "butt"; //正常 不超出
context.stroke();
context.beginPath();
context.moveTo(100,400);
context.lineTo(700,400);
context.lineCap = "round"; //超出 开始和结尾是圆形
context.stroke();
context.beginPath();
context.moveTo(100,600);
context.lineTo(700,600);
context.lineCap = "square"; //超出 开始和结尾是方形
context.stroke();
context.lineWidth = 1;
context.strokeStyle = "#27a";
context.moveTo(100,100);
context.lineTo(100,700);
context.moveTo(700,100);
context.lineTo(700,700)
context.stroke()
}else{
alert('当前游览器不支持Canvas，请更换游览器后再试！');
}
}
</script>
</body>
<script>
/*总结
lineCap
butt(default)
round
square
*/
</script>
</html>
