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<!DOCTYPE html> <html> <body> <p>不使用 clip()：</p> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); // Draw a rectangle ctx.rect(50,20,200,120); ctx.stroke(); // Draw red rectangle ctx.fillStyle="green"; ctx.fillRect(0,0,150,100); </script> <br /> <p>使用 clip()：</p> <canvas id="myCanvas2" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas2"); var ctx=c.getContext("2d"); // Clip a rectangular area ctx.rect(50,20,200,120); ctx.stroke(); ctx.clip(); // Draw red rectangle after clip() ctx.fillStyle="green"; ctx.fillRect(0,0,150,100); </script> </body> </html>