canvas画出向上的箭头，通过这个例子更加详细的了解canvas
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<!DOCTYPE html >
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<html>
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<head>
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<title>cars</title>
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<script src=""></script>
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</head>
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<body>
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<canvas id ="canvas" width="200" height="200"></canvas>
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<script>
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var canvas = document.getElementById("canvas");
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var ctx = canvas.getContext("2d");
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ctx.fillStyle = "SkyBlue";
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ctx.lineWidth = 4;
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ctx.beginPath();
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ctx.moveTo(100,100);
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ctx.lineTo(100,60);
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ctx.lineTo(130,30);
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ctx.lineTo(160,60);
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ctx.lineTo(160,100);
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ctx.lineTo(100,100);
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ctx.fill();
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</script>
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</body>
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</html>
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