它含有的属性有：
动画或静态
鼠标单击时自动伸缩
2D或3D
定制任何一部分的描述

Key features:

    * Animated or static
    * Pull the slice in or out on click
    * 3D or 2D
    * Values can be displayed in the legend
    * Custom description for any slice
    * Clickable slices (you can use this feature for drill-down charts)
    * Grouping small slices into one slice
    * Partial pies

Common amCharts features:

    * Platform-independent
    * Can be exported as an image
    * Can be controlled via JavaScript
    * Settings and data can be passed directly from an HTML file
    * Custom image or Flash (animated) backgrounds
    * Unlimited labels
    * Rotated labels and axis values
    * Data can be automatically reloaded with a preset frequency
    * Format any balloon text