<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
canvas{width: 1000px;height: 500px;}
</style>
</head>
<body>
<canvas id="canvas" width="1000" height="500" ></canvas>
</body>
<script>
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
context.beginPath();
context.moveTo(100,200);
context.lineTo(200,200);
context.moveTo(100,300-0.5);
context.lineTo(200,300-0.5);
context.stroke();
</script>
</html>
在偶然的情况下。我发现-0.5能实现我想要让线条变细的样式，lineWidth明明是设置线宽，但实际上是附带了颜色深浅。最小只能到1.但是为什么我设置坐标减少0.5后线条反而变细了呢？不太懂。求解
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