new option(text, value, defaultSelected, selected);

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本文介绍如何使用newOption构造函数创建Option对象，包括text、value、defaultSelected和selected四个参数的作用及使用方法。通过该构造函数可以为下拉列表添加选项，并设置初始选中状态。

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语法:
      new Option(text, value, defaultSelected, selected)

说明:
      The Option constructor or the HTML tag. To create an Option object with its constructor:

      Once you've created an Option object, you can add it to a selection list using the Select.optionsarray.

参数:
   text
   (Optional) Specifies the text to display in the select list.

   value
   (Optional) Specifies a value that is returned to the server when the option is selected and the form is submitted.

   defaultSelected
          (Optional) Specifies whether the option is initially selected (true or false).

   selected
(Optional) Specifies the current selection state of the option (true or false).