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HTML 参考手册
HTML canvas lineWidth 属性
tryhtml5_canvas_linewidth2
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<!DOCTYPE html> <html> <body> <h1>HTML5 Canvas</h1> <h2>The lineWidth Property</h2> <canvas id="myCanvas" width="300" height="150" style="border:1px solid grey"></canvas> <script> const c = document.getElementById("myCanvas"); const ctx = c.getContext("2d"); ctx.lineWidth = 10; // Begin a new Path ctx.beginPath(); ctx.moveTo(0, 100); ctx.lineTo(200, 100); // Draw the Path ctx.stroke(); </script> </body> </html>