兼容IE浏览器的canvas画线和圆圈

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1.新建test.html文件，代码如下：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>人脉地图</title>
    <script type="text/javascript" src="js/jquery.js"></script>
    
    <![endif]-->
    <script>
        (function($){
            $(window).on('load', function(){
                getline();
                drawarc();
            });
        })(jQuery);
        function getline(){
            var myCanvas = document.getElementById("box1");
            var context = myCanvas.getContext("2d");
            context.strokeStyle = "blue";
            context.lineWidth = 1;
            context.beginPath();
            context.strokeRect(0,0,300,200);
            context.strokeStyle = "red";
            context.moveTo(50,50);
            context.lineTo(100,100);
            context.stroke();
        }
        function drawarc(){
            var c = document.getElementById("box1");
            var ctx = c.getContext("2d");
            ctx.beginPath();
            ctx.lineWidth = 1;
            //画圈
            ctx.arc(100, 100, 20, 0, Math.PI * 2, true);
            ctx.stroke();
        }
    </script>