canvas-2lineCap.html 

<!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>

 

posted @ 2015-11-19 17:28  Cynthia娆墨旧染  阅读(232)  评论(0)    收藏  举报