這篇文章主要匯總介紹了JavaScript實現添加、查找、刪除元素的方法，十分的簡單實用，有需要的小伙伴可以參考下。
代碼很簡單，這裡就不多廢話了。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>測試文件</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: 楷體; 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="">中央情報局</a>:中央情報局</div> <div class="time">2014年5月4日21:56</div> <div class="replyButton"> <input type="button" id="submitButton" value="回復" onClick="showReplyArea(this)" /> </div> <div class="replyButton"> <input type="button" id="cancelButton" value="取消" onClick="hideReplyArea(this)" /> </div> </div> </div> <script> //顯示文本框的函數 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; } //隱藏文本框的函數 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; } //下面為調試時測試用函數，做完後就沒用了，但也是很經典的一段代碼，就留在這裡了。 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：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 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|^ ) 判斷前面是否有空格 （s | $ ）判斷後面是否有空格 兩個感歎號為轉換為布爾值 以方便做判斷 }; 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方法是替換 }; }; };以上所述就是本文的全部內容了，希望大家能夠喜歡。