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> <div> <div><a href="">中央情报局</a>:中央情报局</div> <div>2014年5月4日21:56</div> <div> <input type="button" id="submitButton" value="回复" /> </div> <div> <input type="button" id="cancelButton" value="取消" /> </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。