canvas 基本使用----描边 填充 合并两个canvas

 

 

效果如下：

 

【代码】：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>canvas写字</title>
</head>
<body>
    <div id="container">
        <canvas id="cavsElem">
            你的浏览器不支持canvas，请升级浏览器
        </canvas>
        <canvas id="cavsElem2">
            你的浏览器不支持canvas，请升级浏览器
        </canvas>
    </div>
</body>
<script>
    var canvas = document.querySelector('#cavsElem'); // 得到canvas元素
    canvas.width = 700;
    canvas.height = 500;
    canvas.style.border = "1px solid #000"; // 画布创建完成
    var ctx = canvas.getContext('2d'); // 得到context对象，下面画具体内容
    ctx.font = '20px "微软雅黑"';
    ctx.strokeStyle = "blue" // 描边<----
    ctx.strokeRect(0,0,400,200);
    ctx.fillStyle = 'yellow' // 填充<----
    ctx.fillRect(325,100,200,200);
    ctx.fillStyle = "red" // 文字颜色
    ctx.textBaseline = "bottom";
    ctx.fillText("hello world",30,100);
    

    var canvas2 = document.querySelector('#cavsElem2');
    canvas2.width = 300;
    canvas2.height = 100;
    canvas2.style.border = "1px solid #f66";
    canvas2.style.display = "block"; // 变为块级元素
    canvas2.style.margin = "50px auto";
    var ctx2 = canvas2.getContext('2d');
    ctx2.font = '20px "微软雅黑"';
    ctx2.textBaseline = "bottom";
    ctx2.fillText("1234567890",0,50);

    canvas.getContext("2d").drawImage(canvas2,0,0); // 把canvas2的文字写入canvas
    
    // var img = new Image();
    // img.style.display = 'block'
    // img.style.marginLeft = '500px'
    // img.onload = function(){
    //     // 将图片画到canvas2上面上去！
    //     ctx2.drawImage(img,0,0)
    // }
    // img.src = '../bf2d35be6d8efa48c76c2bfc3e9ead7.jpg'
    // img.src = 'http://www.365mini.com/static/image/cry.gif'
    // img.width = '10'
    // canvas.getContext('2d').drawImage(canvas2, 0, 0)
    
    // var imageData = ctx2.getImageData(0, 0, 300, 100)
    // ctx.putImageData(imageData, 20,20, 400, 280)


</script>
</html>

 

posted @ 2020-05-26 14:16  牧羊狼  阅读(2333)  评论(0)  编辑  收藏  举报