返回值:jQueryreplaceAll(target)

Replace each target element with the set of matched elements.

The .replaceAll() method is corollary to .replaceWith(), but with the source and target reversed. Consider this DOM structure: 

<div class="container">
  <div class="inner first">Hello</div>
  <div class="inner second">And</div>
  <div class="inner third">Goodbye</div>
</div>

We can create an element, then replace other elements with it:

$('<h2>New heading</h2>').replaceAll('.inner');

This causes all of them to be replaced:

<div class="container">
  <h2>New heading</h2>
  <h2>New heading</h2>
  <h2>New heading</h2>
</div>

Or, we could select an element to use as the replacement:

$('.first').replaceAll('.third');

This results in the DOM structure:

<div class="container">
  <div class="inner second">And</div>
  <div class="inner first">Hello</div>
</div>

From this example, we can see that the selected element replaces the target by being moved from its old location, not by being cloned.

示例:

Replace all the paragraphs with bold words.

<!DOCTYPE html>
<html>
<head>
<script src="jquery.min.js"></script>
</head>
<body>

<p>Hello</p>
  <p>cruel</p>
  <p>World</p>

<script>

$("<b>Paragraph. </b>").replaceAll("p"); // check replaceWith() examples

</script>
</body>
</html>
演示: