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<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>
<select>
<option value="0">请选择</option>
<option value="1">One</option>
<option value="2">Two</option>
</select>
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$('select').on('change', function() {
alert( this.value );
})
输入 CSS 代码……