原生JS动态添加与删除DOM元素详解

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>动态添加新元素</title>
</head>
<body>

<ul class="example">
 <li class="child">Coffee</li>
 <li class="child">Tea</li>
 <li class="child">Coffee</li>
 <li class="child">Tea</li>
</ul>

<script>
var child = document.getElementsByClassName("child")[0];
  var newChild = document.createElement("li");
  var newText = document.createTextNode("wine");
  newChild.appendChild(newText);
  child.appendChild(newChild)
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>删除元素</title>
<style>

</style>
</head>
<body>

<ul class="example">
 <li class="child">Coffee</li>
 <li class="child">Tea</li>
 <li class="child">Coffee</li>
 <li class="child">Tea</li>
</ul>

<script>
var parent = document.querySelectorAll(".example")[0];
var child = document.querySelectorAll(".child")[2];
  document.writeln(child.innerHTML)
  parent.removeChild(child);  //第二种方法此行替换:child.parentNode.removeChild(child);
</script>
</body>
</html>