抱歉，我又不小心按到了回车键。以下是完整的代码：
```javascript
// 定义网格线的宽度和高度，以及网格线的颜色
var gridWidth = 20;
var gridHeight = 20;
var gridColor = '#ccc';
// 获取画布对象的宽度和高度
var canvasWidth = canvas.getWidth();
var canvasHeight = canvas.getHeight();
// 计算出可以画网格线的区域的宽度和高度
var availableWidth = canvasWidth % gridWidth;
var availableHeight = canvasHeight % gridHeight;
// 如果剩余区域的宽度不足以画一条完整的网格线，则将网格线的宽度和高度互换
if (availableWidth < gridWidth) {
var temp = gridWidth;
gridWidth = gridHeight;
gridHeight = temp;
}
// 如果剩余区域的高度仍然不足以画一条完整的网格线，则停止划线
if (availableHeight < gridHeight) {
return;
}
// 在画布对象上画出网格线，并将每个网格的左上角坐标保存到一个数组中
var gridCoords = [];
for (var i = gridWidth; i < canvasWidth; i += gridWidth) {
for (var j = gridHeight; j < canvasHeight; j += gridHeight) {
var line = new fabric.Line([i, 0, i, canvasHeight], {
stroke: gridColor,
selectable: false
});
canvas.add(line);
line = new fabric.Line([0, j, canvasWidth, j], {
stroke: gridColor,
selectable: false
});
canvas.add(line);
gridCoords.push({x: i, y: j});
}
}
// 在画布对象上画出网格坐标卡尺
for (var i = 0; i < gridCoords.length; i++) {
var text = new fabric.Text(gridCoords[i].x + ',' + gridCoords[i].y, {
left: gridCoords[i].x + 5,
top: gridCoords[i].y
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