canvas plot画线

要在canvas上绘制一条直线，你可以使用以下代码:

var canvas = document.getElementById("canvas");
canvas.width = 800;
canvas.height = 800;
var context = canvas.getContext("2d");
context.lineWidth = 8;
context.strokeStyle = "#333";
context.beginPath();
context.moveTo(100, 100);
context.lineTo(500, 500);
context.stroke();

这段代码首先获取到了canvas元素，并设置了它的宽高。然后通过调用getContext("2d")方法获取到了上下文的环境。接下来，设置了线条的宽度和颜色。使用beginPath()方法开始一个新的绘制路径，并使用moveTo()方法移动到起始点(100, 100)，之后使用lineTo()方法绘制一条直线到目标点(500, 500)，最后调用stroke()方法进行绘制。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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