jQuery Selector - 如何按值選擇屬性

我們想知道如何按值選擇屬性。

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<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.parent {
  background: red;
  margin: 20px;
  padding: 20px;
}
.child {
  background: blue;
  margin: 20px;
  padding: 20px;
}
.parent:hover .child {
  background: yellow;
}
</style>
</head>
<body>
  <div class="parent">
    <div class="child"></div>
  </div>
  <div class="parent">
    <div class="child"></div>
  </div>
</body>
</html>
 
 
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jQuery Selector - 如何按值選擇屬性
