1.rect() 方法是單純的畫出一個矩形框,調用stroke() 或 fill()後纔會真正作用於畫布。
例如:
<!DOCTYPE html>
<html>
<head>
<title>canvas test</title>
</head>
<body>
<canvas id="mytest" width="200px" height="100px" style="border:1px solid red">
your browser does not support HTML5 canvas tag!
</canvas>
<script>
var c = document.getElementById('mytest');
var ctx = c.getContext('2d');
ctx.rect(0,0,100,50); //僅僅是畫出一個區域
ctx.fillStyle = 'red';
ctx.fill();
</script>
</body>
</html>
樣式:
2.fillRect() 方法是畫出一個有填充顏色的矩形框(默認是黑色的)
例如:
<!DOCTYPE html>
<html>
<head>
<title>canvas test</title>
</head>
<body>
<canvas id="mytest" width="200px" height="100px" style="border:1px solid red">
your browser does not support HTML5 canvas tag!
</canvas>
<script>
var c = document.getElementById('mytest');
var ctx = c.getContext('2d');
//ctx.rect(0,0,100,50);
ctx.fillStyle = 'red';
ctx.fillRect(0,0,100,50); //如果不定義fillstyle,那麼會顯示默認的黑色
</script>
</body>
</html>
樣式:3.strokeRect() 方法是用一個預定義的筆觸畫出一個矩形框,你就可以想成使用一直有顏色的畫筆去畫一個矩形
例如
<!DOCTYPE html>
<html>
<head>
<title>canvas test</title>
</head>
<body>
<canvas id="mytest" width="200px" height="100px" style="border:1px solid red">
your browser does not support HTML5 canvas tag!
</canvas>
<script>
var c = document.getElementById('mytest');
var ctx = c.getContext('2d');
//ctx.rect(0,0,100,50);
//ctx.fillStyle = 'red';
ctx.strokeRect(20,20,100,50);
</script>
</body>
</html>
樣式: