一点启示 Supporting LegacyBrowsers The slicing tool creates a new browser instance, which loads Ext JS and a specified CSS file. Once loaded, it parses a JavaScript file which includes every Ext JS component that needs styling (panel, window, toolbar, etc.). It then analyzes each of those components and determines the size and location of each image that needs to be sliced. It then slices each of the images, sprites them together and saves them in the location defined in the manifest.