FileDialog — Allows the user to select a file.
FileDialog——允许用户选择文件。
As shown on lines 15 and 16, a FileDialog object is created.
如第15行和第16行所示，创建一个FileDialog对象。
openMenuItem will cause a fileDialog to appear (a modal dialog to open a locally stored Web page).
openMenuItem将导致一个fileDialog出现（一个模式对话框将打开一个本地存储的Web网页）。
FileDialog will load a new file and then increment the index variable which is used by the application's queue in order to track previously visited Web pages.
fileDialog将加载一个新文件，然后递增index变量，应用程序的queue使用该变量跟踪此前访问过的web页面。
FileDialog will load a new file and then increment the index variable which is used by the application's queue in order to track previously visited Web pages.
fileDialog将加载一个新文件，然后递增index变量，应用程序的queue使用该变量跟踪此前访问过的web页面。
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