javascript - 使用 for 循环动态创建在 Canvas 中绘制的图像

Question

这是我的代码:

<canvas id="hour6" width="1024px" height="764px">
    <img id="hour6map" src=""/>
</canvas>

<canvas id="hour12" width="1024px" height="764px">
    <img id="hour12map" src=""/>
</canvas>

<canvas id="hour18" width="1024px" height="764px">
    <img id="hour18map" src=""/>
</canvas>

<canvas id="hour24" width="1024px" height="764px">
    <img id="hour24map" src=""/>
</canvas>

<canvas id="hour30" width="1024px" height="764px">
    <img id="hour30map" src=""/>
</canvas>

<canvas id="hour36" width="1024px" height="764px">
    <img id="hour36map" src=""/>
</canvas>

<canvas id="hour42" width="1024px" height="764px">
    <img id="hour42map" src=""/>
</canvas>

<canvas id="hour48" width="1024px" height="764px">
    <img id="hour48map" src=""/>
</canvas>

我需要能够使用 for 循环在 Canvas 中动态创建所有这些图像。谁能告诉我如何使用 for 循环生成所有这些带有图像的 Canvas 。

Answer 1

你可以尝试这样:

var canvas,
    img,
    index;

for (var i = 0; i < 8; i++) {
    index = 6 * (i + 1);
    canvas = document.createElement("canvas");
    canvas.id = "hour" + index;
    canvas.width = 1024;
    canvas.height = 764;
    img = document.createElement("img");
    img.id = "hour" + index + "map";
    img.src = "";
    canvas.appendChild(img);
    document.body.appendChild(canvas);
}