根据jointjs changelog,您现在可以通过drawGrid选项显示网格joint.dia.paper.
这是一个例子:
var paper = new joint.dia.Paper({
el: $('#myholder-small'),
width: 600,
height: 100,
model: graph,
gridSize: 15,
drawGrid:true
});
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PS:jointjs doc没有明确这个选项.