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function canvas1(){
?? ?var canvas1 = document.getElementById("canvas1");
?? ?canvas1.width = 500;
?? ?canvas1.height = 500;
?? ?var context1 = canvas1.getContext('2d');
?? ?context1.moveTo(50,50);
?? ?context1.lineTo(50,450);
?? ?context1.lineTo(450,450);
?? ?context1.lineTo(450,50);
?? ?context1.lineTo(50,50);
?? ?context1.moveTo(50,50);
?? ?context1.lineTo(450,450);
?? ?context1.moveTo(450,50);
?? ?context1.lineTo(50,450);
?? ?context1.lineWidth = 5;? //線條的寬度
?? ?context1.strokeStyle = '#660000'; //線條的顏色
?? ?context1.stroke();?? ?
?? ?}