JavaScript添加、查找、删除元素的一个实例

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>测试文件</title>
<style>
.reply {
    width: 500px;
    height: 100%;
    overflow: hidden;
    background-color:#CCC;
    margin-top: 10px;
}
.infoArea {
    width: 380px;
    height: 100%;
    overflow: hidden;
}
.words {
    width: 380px;
    height: auto;
    margin: 5px 0px;
    float: left;
    font-size: 14px;
}
.time {
    margin-left: 10px;
    margin-bottom: 3px;
    width: 150px;
    height: 20px;
    line-height: 20px;
    float: left;
    font-family: 楷体;
    font-size: 14px;
    color: #999;
}
.replyButton {
    width: 60px;
    height: 20px;
    float: left;
    margin-bottom: 10px;
}
.replyButton input {
    font-size: 12px;
}
#cancelButton {
    visibility: hidden;
}
</style>
</head>

<body>
<div class="reply">
  <div class="infoArea">
    <div class="words"><a href="">中央情报局</a>:中央情报局</div>
    <div class="time">2014年5月4日21:56</div>
    <div class="replyButton">
      <input type="button"  id="submitButton" value="回复" onClick="showReplyArea(this)" />
    </div>
    <div class="replyButton">
      <input type="button"  id="cancelButton" value="取消" onClick="hideReplyArea(this)" />
    </div>
  </div>
</div>
<script>
//显示文本框的函数
function showReplyArea(src)
{
    inputText = document.createElement("DIV");
    inputText.className = "inputText";
    inputText.style.width = '100%';
    inputText.style.height = '75px';
    inputText.style.margin = '3px 0';
    inputText.style.cssFloat = 'left';
    
    var grandfather = src.parentNode.parentNode.parentNode;
    grandfather.appendChild(inputText);
    
    form1 = document.createElement("FORM");
    form1.action = "";
    form1.method = "post";
    inputText.appendChild(form1);
    
    inputTextArea = document.createElement("TEXTAREA");
    inputTextArea.style.width = '380px';
    inputTextArea.style.height = '40px';
    inputTextArea.style.marginLeft = '60px';
    inputTextArea.style.marginTop = '3px';
    inputTextArea.style.cssFloat = 'left';
    inputTextArea.style.resize = 'none';
    
    textSubmit = document.createElement("INPUT");
    textSubmit.type = 'submit';
    textSubmit.value = '提交';
    textSubmit.style.marginLeft = '80px';
    textSubmit.style.cssFloat = 'left';
    
    form1.appendChild(inputTextArea);
    form1.appendChild(textSubmit);
    
    cancelButton = grandfather.getElementsByTagName("INPUT").item(1);
    cancelButton.style.visibility = 'visible';
    submitButton = src;
    submitButton.disabled = true;
}
//隐藏文本框的函数
function hideReplyArea(src)
{
    var grandfather = src.parentNode.parentNode.parentNode;
    var inputText = grandfather.getElementsByClassName('inputText').item(0);
    grandfather.removeChild(inputText);
    
    cancelButton = src;
    cancelButton.style.visibility = 'hidden';
    submitButton = grandfather.getElementsByTagName("INPUT").item(0);
    submitButton.disabled = false;
}

//下面为调试时测试用函数，做完后就没用了，但也是很经典的一段代码，就留在这里了。
function showNode()
{
    var i = 4;
    submitButton = document.getElementById('submitButton');
    i = submitButton.parentNode.parentNode.getElementsByTagName("INPUT").item(1).value;
    alert(i);
}
</script>
</body>
</html>

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原文地址：https://www.cnblogs.com/dige1993/p/4606227.html