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<!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> 您的浏览器不支持 HTML5 canvas 标签。</canvas> <p>尝试将 miterLimit 设置为 4（然后，斜接长度将超过斜接限制），当线相交时将显示为 lineJoin="bevel"。</p> <script> var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); ctx.lineWidth = 10; ctx.lineJoin = "miter"; ctx.miterLimit = 5; ctx.moveTo(20, 20); ctx.lineTo(50, 27); ctx.lineTo(20, 34); ctx.stroke(); </script> </body> </html>