angularJS select指令ngOptions选项

in one of the following forms:

• for array data sources:
  • labelforvalueinarray
  • selectaslabelforvalueinarray
  • labelgroupbygroupforvalueinarray
  • selectaslabelgroupbygroupforvalueinarraytrackbytrackexpr
• for object data sources:
  • labelfor(key,value)inobject
  • selectaslabelfor(key,value)inobject
  • labelgroupbygroupfor(key,value)inobject
  • selectaslabelgroupbygroupfor(key,value)inobject

Where:

• array/object: an expression which evaluates to an array / object to iterate over.
• value: local variable which will refer to each item in thearrayor each property value ofobjectduring iteration.
• key: local variable which will refer to a property name inobjectduring iteration.
• label: The result of this expression will be the label for<option>element. Theexpressionwill most likely refer to thevaluevariable (e.g.value.propertyName).
• select: The result of this expression will be bound to the model of the parent<select>element. If not specified,selectexpression will default tovalue.
• group: The result of this expression will be used to group options using the<optgroup>DOM element.
• trackexpr: Used when working with an array of objects. The result of this expression will be used to identify the objects in the array. Thetrackexprwill most likely refer to thevaluevariable (e.g.value.propertyName).

（编辑：李大同）

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