通过<option>更改输入的占位符

Question

我需要一些帮助，通过<select>，

更改输入的占位符

我的意思是如果<select>的选项已更改，我需要更改输入的占位符

我的代码：

<select id="select" name="se">
   <!-- if this is chosen placeholder will be 'you have chosen option n1' !-->
   <option value="1">option 1</option>
   <!-- if this is chosen placeholder will be 'you have chosen option n2' !-->
   <option value="2">option 2</option>
   <!-- if this is chosen placeholder will be 'you have chosen option n3' !-->
   <option value="3">option 3</option>
</select>
<input type="text" id="inp" name="choosen">

Answer 1

试试这个：

$('select').on("change",function()
{
   $('#inp').val("you have chosen option n" + $.trim(this.value));
}).change();

示例：https://jsfiddle.net/DinoMyte/zcL12b1u/1/