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DOM Option 对象 
Option 对象
The Option object represents a selectable option in a drop-down list in an HTML form. For each instance of an <option> tag in an HTML form, an Option object is created.
Option对象代表HTML表单中的可选项。HTML表单中只要出现<option>标签就有Option对象被建立
You can access an Option object by indexing the elements array (by number or name) of the corresponding form or by using getElementById().
你可以从表单数组的数字或是名称来访问Option对象，或是使用getELmentById()来访问它
IE: Internet Explorer, F: Firefox, N: Netscape, W3C: World Wide Web Consortium (Internet Standard).
Option 对象属性
| Property 属性 |
Description 描述 |
IE | F | N | W3C |
|---|---|---|---|---|---|
| defaultSelected | Sets or returns the value of the selected attribute of the option 设置或是返回Optionselected属性的值 |
3 | 1 | 6 | Yes |
| disabled | Sets or returns a Boolean value that specifies whether the option should be disabled 设置或返回一个布耳值判断Option是否禁用 |
5 | 1 | 6 | Yes |
| form | Returns a reference to the form that contains the option 返回包含Option表单的参考 |
3 | 1 | 6 | Yes |
| id | Sets or returns the id of the option (In IE 4 this property is read-only) 设置或返回Option的id(在IE4中这个属性为只读) |
4 | 1 | No | |
| index | Sets or returns the position of the option in the select box 设置或返回Option在select框中的位置 |
3 | Yes | ||
| label | Sets or returns a label for the option object 设置或返回Option对象的label |
6 | Yes | ||
| selected | Sets or returns the current state of the option 设置或返回Option的当前状态（是否为选中） |
3 | 1 | 6 | Yes |
| text | Sets or returns the text value for the <option> tag 设置或返回Option标签的文字值 |
3 | 1 | 6 | Yes |
| value | Sets or returns the value to be returned to the server when an option is selected and the form is submitted 设置或返回当被选中的Option提交到服务器时它所包含的值 |
3 | 1 | 6 | Yes |
Option 对象方法
| Method 方法 |
Description 描述 |
IE | F | N | W3C |
|---|---|---|---|---|---|
| click() | Simulates a mouse-click on the option 模仿鼠标点击Option |
4 | No |
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