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<!DOCTYPE html> <html> <head> <title>使用save和restore繪製圖形</title> </head> <body> <!-- Start your code here --> <p class="lw"></p> <canvas id="m" width="1000" height="200"></canvas> <!-- End your code here --> </body> </html>
.lw { font-size: 60px; }
/* Write JavaScript here */ var canvas=document.getElementById('m'); var ctx=canvas.getContext('2d'); //儲å˜canvas會å˜åœ¨Stack內。Stack特性是最後儲å˜çš„數值會最先顯示，所以如果呼å«restore方法，會顯示最近的æ繪狀態，在呼å«ä¸€æ¬¡çš„話就會顯示之å‰çš„狀態。// ctx.beginPath(); ctx.fillStyle="red"; ctx.arc(80, 80, 50, 0, Math.PI*2, true);//arc(x,y,r,starAngle, endAngle, anticlockwise) ctx.fill(); ctx.save(); ctx.beginPath(); ctx.fillStyle="yellow"; ctx.arc(210, 80, 50, 0, Math.PI*2, true); ctx.fill(); ctx.save(); ctx.beginPath(); ctx.fillStyle="#000000"; ctx.arc(340, 80, 50, 0, Math.PI*2, true); ctx.fill(); ctx.restore(); ctx.arc(470,80, 50, 0, Math.PI*2, true); ctx.restore(); ctx.arc(600, 80, 50, 0, Math.PI*2, true); ctx.fill();