jquery option operate
http://HdhCmsTestelectrictoolbox测试数据/jquery-add-option-select-jquery/
How to Remove All Options from a Dropdown Select Box with JavaScript
To remove all options from a dropdown select box with JavaScript, simply set the length property of the dropdown box to 0. For instance, if a dropdown select box is defined as follows:
<select name='Dropdown' id='Dropdown'>
<option value='1'>1</option>
<option value='2'>2</option>
</select>
Use this JavaScript to remove all the options in the dropdown select box.
document.getElementById('Dropdown').length = 0;
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