那么多的交互设计模式中，“拖放（Drag and Drop）”模式是开发者感觉比较不错的。用户日常在进行拖放操作的时候，真的是想都不用想地就可以轻松搞掂了，易学易用，非常直观。下文中，不是我们断言，只要将下面五个步骤的要义领会在心，拖放不再是一间难事。
定义拖放拖动（drag）的动作，就是鼠标的点击动作发生了，点击在某些UI元素身上，就可以按着不放，同时也可以移动着鼠标；放下（drop）的动作，就是在拖动动作开始后，但鼠标按钮松开了——就是放下的动作。
We are very excited to announce that we’ve released , our desktop application for rapidly generating Ext JS interfaces. Ext Designer is a full cross-platform (Windows, Mac, and Linux) desktop application written completely in Ext JS. We’ve been hard at work on Ext Designer, and we know you’ll find it worth the wait. .
We actually had a soft release last month on Twitter in order to quash some early bugs before announcing everywhere.
