javascript - Materialise CSS Dropdown 更新 DOM insideText

Question

我有一个用 Materialise CSS 制作的下拉菜单。我试图在用户单击“按钮”时更改其上的文本，但由于某种原因它不会更新 DOM。

var changeText;
changeText = function(){
  if(this.innerText === 'test'){
    this.innerText = 'success';
  } else {
    this.innerText = 'test';
  }
  
  $('.dropdown-trigger').dropdown({
    alignment: 'right',
    constrainWidth: false,
    coverTrigger: false
  });
  
  console.log(this.innerText);
};

$( document ).ready(function() {

  $('.dropdown-trigger').dropdown({
    alignment: 'right',
    constrainWidth: false,
    coverTrigger: false
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css" rel="stylesheet"/>

<!-- Dropdown Trigger -->
<a class='dropdown-trigger btn' href='#' data-target='dropdown1'>Drop Me!</a>

<!-- Dropdown Structure -->
<ul id='dropdown1' class='dropdown-content'>
  <li><a href="#" onclick="changeText()">test</a></li>
</ul>

我尝试重新初始化下拉触发器，希望能够更新 DOM，但没有效果。正如您在控制台日志中看到的那样，innerText 按预期更改。

Answer 1

this 指的是此处的窗口对象。所以尝试 event.target

var changeText;
changeText = function(){
  if(event.target.innerText === 'test'){
    event.target.innerText = 'success';
  } else {
    event.target.innerText = 'test';
  }  
  console.log(this.innerText);
};

$( document ).ready(function() {

  $('.dropdown-trigger').dropdown({
    alignment: 'right',
    constrainWidth: false,
    coverTrigger: false
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css" rel="stylesheet"/>

<!-- Dropdown Trigger -->
<a class='dropdown-trigger btn' href='#' data-target='dropdown1'>Drop Me!</a>

<!-- Dropdown Structure -->
<ul id='dropdown1' class='dropdown-content'>
  <li><a href="#" onclick="changeText()">test</a></li>
</ul>