javascript - 如何在选项文本上添加文本而不删除值？

Question

我在尝试添加一些文本而不更改选项选择的值时遇到问题。

您能帮我解决这个问题吗？

我有这个 HTML 代码

<select id="q_c_0_a_0_name">
 <option value="name">     Name</option>
 <option value="lastanem1">First Lastname</option>
 <option value="lastname2">Second Lastname</option>
 ...
 <option value="xxxxxxxxx">Other value</option>
</select>

我正在尝试将文本添加到文本选项而不删除值。

<select id="q_c_0_a_0_name">
 <option value="name">     Filter by Name</option>
 <option value="lastanem1">Filter by First Lastname</option>
 <option value="lastname2">Filter by Second Lastname</option>
 ...
 <option value="xxxxxxxxx">Filter by Other value</option>
</select>

我尝试了这个 Jquery 代码:

$(function(){
  $("#q_c_0_a_0_name option[value=cont]").textContent  += "Filter by";
});  

还尝试了这个 Jquery 代码:

$(function(){
  $("#q_c_0_a_0_name option[value]").textContent  += "Filter by";
});  

Answer 1

使用text()

$("#q_c_0_a_0_name option").text(function() {
  return "Filter by " + $(this).text()
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<select id="q_c_0_a_0_name">
  <option value="name"> Name</option>
  <option value="lastanem1">First Lastname</option>
  <option value="lastname2">Second Lastname</option>
  <option value="xxxxxxxxx">Other value</option>
</select>