定制QueryReadStore以支持部分加载。

Customize QueryReadStore to support partial loading.

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在这一小节，您将定制QueryReadStore和TreeGrid来实现部分加载和修复回归bug。

In this section, you'll customize QueryReadStore and TreeGrid to implement partial loading and fix regression bugs.

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要同时使用树型网格的展开功能和 QueryReadStore，您必须定制 QueryReadStore 使其能支持一个部分加载的条目。

To make the expand function of tree grid work with QueryReadStore, you must customize QueryReadStore to make it work with a partially loaded item.

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