代码很简单，这里就不多废话了。
<!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>
示例二：
window.onload = function() {
var gaga = document.getElementById("gaga");
addClass(gaga, "gaga1") addClass(gaga, "gaxx");
removeClass(gaga, "gaga1") removeClass(gaga, "gaga") function hasClass(elements, cName) {
return !! elements.className.match(new RegExp("(\s|^)" + cName + "(\s|$)")); // ( \s|^ ) 判断前面是否有空格 （\s | $ ）判断后面是否有空格 两个感叹号为转换为布尔值 以方便做判断
};
function addClass(elements, cName) {
if (!hasClass(elements, cName)) {
elements.className += " " + cName;
};
};
function removeClass(elements, cName) {
if (hasClass(elements, cName)) {
elements.className = elements.className.replace(new RegExp("(\s|^)" + cName + "(\s|$)"), " "); // replace方法是替换
};
};
};
以上所述就是本文的全部内容了，希望大家能够喜欢。
