【導(dǎo)讀】和其它允許用戶交互的內(nèi)容。Flash可以包含簡單的動(dòng)畫、視頻內(nèi)容、復(fù)雜演示文稿和。通常，使用Flash創(chuàng)作的各個(gè)內(nèi)容單元稱為。效果，構(gòu)建包含豐富媒體的Flash應(yīng)用程序。Flash特別適用于創(chuàng)建通過Inter提供的內(nèi)容，因?yàn)樗奈募浅Ｐ?。是通過廣泛使用矢量圖形做到這一點(diǎn)的。與位圖圖形相比，矢量圖形需要的內(nèi)存和存儲(chǔ)?？臻g小很多，因?yàn)樗鼈兪且詳?shù)學(xué)公式而不是大型數(shù)據(jù)集來表示的。是因?yàn)閳D像中的每個(gè)像素都需要一組單獨(dú)的數(shù)據(jù)來表示。位于較高圖層中的圖形顯示在較低圖層中的圖形的上方。庫面板是Flash顯示Flash文檔中的媒體元素列表的位置。ActionScript添加到文檔的內(nèi)置行為，以及可以添加到媒體對象的特殊效果。能使Flash不僅功能強(qiáng)大，而且易于使用。動(dòng)作響應(yīng)該事件，以及在各種情況下分別應(yīng)該使用哪些ActionScript工具。附加到幀上的腳本稱為幀腳本。幀腳本最常見的一種用法是在到達(dá)特定的關(guān)鍵幀后停止回放。

　　

【正文】 attaching your scripts to elements like keyframes, movie clips, and buttons, you should respond to events by calling functions that reside in a central location. One method is to attach embedded ActionScript to the first or second frame of the Timeline whenever possible so you don’t have to search through the FLA file to find all your code. A mon practice is to create a layer called actions and place your ActionScript code there. When you attach all your scripts to individual elements, you’re embedding all your code in the FLA file. If sharing your code between other Flash applications is important to you, use the Script window or your favorite text editor to create an external ActionScript (AS) file. By creating an external file, you make your code more modular and well anized. As your project grows, this convenience bees much more useful than you might imagine. An external file aids debugging and also source control management if you’re working on a project with other developers. To use the ActionScript code contained in an external AS file, you create a script within the FLA file and then use the include statement to access the code you’ve stored externally, as shown in the following example: include ../core/ You can also use ActionScript to create custom classes. You must store custom classes in external AS files and use import statements in a script to get the classes exported into the SWF file, instead of using include statements. You can also use ponents to share code and functionality. Note: ActionScript code in external files is piled into a SWF file when you publish, export, test, or debug a FLA file. Therefore, if you make any changes to an external file, you must save the file and repile any FLA files that use it. When you write ActionScript in Flash 8, you use the Actions panel, the Script window, or both. When you use the Actions panel or Script window is dictated by how you respond to events, how you anize your code, and, most importantly, coding best practices. About writing scripts to handle events Events can be categorized into two major groups: those that occur on the Timeline (in keyframes) and those that occur on object instances (move clips, buttons, and other symbols). The interactivity of your Flash movie or application can 11 be scattered over the many elements in your project, and you may be tempted to add scripts directly to these elements. However, Macromedia remends that you do not add scripts directly to these elements (keyframes and objects). Instead, you should respond to events by calling functions that reside in a central location. Using the Actions panel and Script window To create scripts that are part of your document, you enter ActionScript directly into the Actions panel. To create external scripts, you can use the Script window (File New ActionScript File) or your preferred text editor. When you use the Actions panel or Script window, you are using the ActionScript editor. Both the Actions panel and Script window have the Script pane (which is where you use the ActionScript editor) and the Actions toolbox. However, the Actions panel, and the Flash authoring environment in general, offer a few more codeassistance features than the Script window. Flash offers these features in the Actions panel because they are especially useful in the context of editing ActionScript within a FLA file.