我在编码中具有div的树形结构。单击“是”时，将显示child div；单击“ child”时，将显示Grand child div。如果单击“否”，则所有子代都将隐藏。在我的编码中工作正常，但是在再次尝试单击yes时隐藏了所有子级之后。.在使用children（）。hide（）隐藏div后，单击Yes的单击功能不起作用方法。为什么会这样呢？HTML代码
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<form >
<div class="form-group" id="main">
<label class="lbl" for="parent" id="parent" > Click on Yes to see child . and click on No to hide all children. </label>
<div class="form-inline">
<div class="form-check">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="parent" value="Yes" id="parent-yes"> Yes </label>
</div>
<div class="form-check">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="parent" value="No" id="parent-no"> No </label>
</div>
</div>
</div>
<div id="children" style="display:none;">
<div id="child1">
I am Child. Click on me to see Grand Child
<div id="child2" style="display:none;">
Grand Child
</div>
</div>
</div>
</div>
</form>
</body>
</html>
Javascript
$(document).ready(function () {
$("#parent-yes").on("click", function () {
$("div#children").show();
});
$("#child1").on("click", function () {
$("div#child2").show();
});
$("#parent-no").on("click", function () {
$("div#children").children().hide();
});
});
[未清除您的要求，但在示例代码中，选择器时设置了错误的ID。
并且当您单击否隐藏时，您将隐藏所有子项，应调用show()单击是$("div#children").children().show()
$(document).ready(function(){
$("#parent-yes").on("click", function(){
$("div#children").css("display", "block");
$("div#children").children().show()
});
$("#child1").on("click", function(){
$("div#child2").css("display", "block");
});
$("#parent-no").on("click", function(){
$("div#children").children().hide()
});
});<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<form >
<div class="form-group" id="main">
<label class="lbl" for="parent" id="parent" > Click on Yes to see child . and click on No to hide all children. </label>
<div class="form-inline">
<div class="form-check">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="parent" value="Yes" id="parent-yes"> Yes </label>
</div>
<div class="form-check">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="parent" value="No" id="parent-no"> No </label>
</div>
</div>
</div>
<div id="children" style="display:none;">
<div id="child1">
I am Child. Click on me to see Grand Child
<div id="child2" style="display:none;">
Grand Child
</div>
</div>
</div>
</div>
</form>
</body>
</html>