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jQuery Selector - 如何nth-child(even)樣式div奇和偶

我們想知道如何nth-child(even)樣式div奇和偶。 


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
div {
  width: 50px;
  height: 50px;
}

div:nth-child(odd) {
  background-color: red;
}

div:nth-child(even) {
  background-color: blue;
}
</style>
</head>
<body>
  <div>...</div>
  <div>...</div>
  <div>...</div>
  <div>...</div>
  <div>...</div>
  <div>...</div>
</body>
</html>