<ajax:servervalidator/> 在使用 onBlur 事件失去焦点时验证目标控件。
The <ajax:servervalidator/> validates the target control upon losing focus using the onBlur event.
用户从列表中选择了一个值之后，控件将失去焦点(在blur事件发生时)，依赖于当前字段的控件将被清除。
After the user selects a value from the list and the control loses focus (upon the blur event), the controls that are dependent on the current field are cleared.
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