如何“ git clone”包括子模块？

问题：

I'm trying to put a submodule into a repo. 我正在尝试将子模块放入存储库中。 The problem is that when I clone the parent repo, the submodule folder is entirely empty. 问题是当我克隆父仓库时，子模块文件夹完全为空。

Is there any way to make it so that git clone parent_repo actually puts data in the submodule folder? 有什么方法可以使git clone parent_repo实际上将数据放入子模块文件夹中吗？

For example, http://github.com/cwolves/sequelize/tree/master/lib/ , nodejs-mysql-native is pointing at an external git submodule, but when I checkout the sequelize project, that folder is empty. 例如， http : nodejs-mysql-native指向外部git子模块，但是当我检出sequelize项目时，该文件夹为空。