<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <canvas id="canvas" style="margin:0 auto;border:1px #ddd solid"> The current browser does not support Canvas, can replace the browser a try! </canvas> <script> window.onload = function(){ var canvas = document.getElementById('canvas'); canvas.width = 1024; canvas.height = 768; if(canvas.getContext('2d')){ var context = canvas.getContext('2d'); context.lineWidth = 5; //案例 ：2arcTo里面注释 }else{ alert('当前游览器不支持Canvas，请更换游览器后再试！'); } } </script> </body> <script> /*贝塞尔二次曲线 起始点（x0,y0） 控制点（x1,y1） 终止点（x2,y2） context.moveTo(x0,y0); context.quadraticCurveTo(x1,y1,x2,y2); */ </script> </html>