这篇文章主要汇总介绍了 JavaScript 实现添加、查找、删除元素的方法,十分的简单实用,有需要的小伙伴可以参考下。
Javascript 是一种由 Netscape 的 LiveScript 发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如 Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
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
- };
- };
- };
来源: http://www.phperz.com/article/17/0221/270573.html