用js新建canvas的方法如下：
var canvas = document.createElement('canvas');
canvas.id = "CursorLayer";
canvas.width = 1224;
canvas.height = 768;
canvas.style.zIndex = 8;
canvas.style.position = "absolute";
canvas.style.border = "1px solid";
document.body.appendChild(canvas);
注意：此处一定要追加到body里面。
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