The Index contains an alphabetic list of all classes, interfaces, constructors, methods, and fields.

索引包含一个字母顺序的所有类，接口，构造器，方法，字段的列表。

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It provides an alphabetic listing with controls to jump to a specific letter page in the contact list as shown in figure 13.

它提供了一个带有控件的字母清单，可以跳到联系人页面中特定字母的页面，如图13所示。

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If the element has a type attribute, use its value to figure out how the number of each list item should be formatted (Roman numerals, Arabic numerals, or alphabetic characters).

如果元素有type属性，则用这个值来决定应该如何格式化每个列表项的数字(罗马数字、阿拉伯数字或按字母次序的字符)。

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