如果我的父 div 有一个仅使用 JavaScript 的子 div，我需要显示警报，而不使用 jQuery。
我尝试过使用contains()函数来检查我的 div 并发送警报，但它不起作用。
<script type="text/javascript">
var parentDiv = document.getElementById("commentBox");
var childDiv = document.getElementById("comment1");
if (parentDiv.contains(childDiv)) {
alert("yes");
} else
{
alert("no");
}
</script>
<div class="row leftpad collapse" id="commentBox">
<div id="comment1">
<div class="col-md-3 dir-rat-left"> <i class="fa fa-user-circle" aria-hidden="true"></i>
<h6>James </h6>
</div>
<div class="col-md-9 dir-rat-right">
<p class="removemarg">always available, always helpfull that goes the same for his team that work with him - definatley our first phone call.</p>
</div>
</div>
</div>
应该有一个带有消息的警报框yes在其中但不可见。我也尝试过使用以下命令检查 JavaScriptalert()仅方法，无需任何代码。
您的代码在 DOM 完全加载之前运行。将脚本移至页面底部：
<div class="row leftpad collapse" id="commentBox" >
<div id="comment1">
<div class="col-md-3 dir-rat-left"> <i class="fa fa-user-circle" aria-hidden="true"></i>
<h6>James </h6>
</div>
<div class="col-md-9 dir-rat-right">
<p class="removemarg">always available, always helpfull that goes the same for his team that work with him - definatley our first phone call.</p>
</div>
</div>
</div>
<script type="text/javascript">
var parentDiv = document.getElementById("commentBox");
var childDiv = document.getElementById("comment1");
if (parentDiv.contains(childDiv)) {
alert("yes");
}
else{
alert("no");
}
</script>
OR:将代码包裹起来DOM内容已加载这将确保放置在其中的代码仅在 DOM 完全加载后才会执行：
<script type="text/javascript">
document.addEventListener("DOMContentLoaded", function(event) {
var parentDiv = document.getElementById("commentBox");
var childDiv = document.getElementById("comment1");
if (parentDiv.contains(childDiv)) {
alert("yes");
}
else{
alert("no");
}
});
</script>
<div class="row leftpad collapse" id="commentBox" >
<div id="comment1">
<div class="col-md-3 dir-rat-left"> <i class="fa fa-user-circle" aria-hidden="true"></i>
<h6>James </h6>
</div>
<div class="col-md-9 dir-rat-right">
<p class="removemarg">always available, always helpfull that goes the same for his team that work with him - definatley our first phone call.</p>
</div>
</div>
</div>
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
