ProjectionPicker

Name	Type	Description
container	Element | String	将包含小部件的DOM元素或ID。
scene	Scene	要使用的场景实例。

Throws:

• DeveloperError ：文档中不存在id为“container”的元素。

Example:

// In HTML head, include a link to the ProjectionPicker.css stylesheet,
// and in the body, include: <div id="projectionPickerContainer"></div>
// Note: This code assumes you already have a Scene instance.

var projectionPicker = new Cesium.ProjectionPicker('projectionPickerContainer', scene);