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html canvas画图

发布时间 2023-10-08 15:02:19作者: boye169

样例

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>canvas画图</title>
<style type="text/css">
canvas {
    border: 1px solid black;
}
</style>
</head>
<body>
<canvas id="canvas" width="300" height="300"></canvas>
<script type="text/javascript">
function draw(){
    var canvas = document.getElementById('canvas');
    if(!canvas.getContext) return;
    var ctx = canvas.getContext("2d");
    ctx.fillStyle = "rgb(200,0,0)";
      //绘制矩形
    ctx.fillRect (10, 10, 55, 50);
 
    ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
    ctx.fillRect (30, 30, 55, 50);
}
draw();
</script>
</body>
</html>