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<title>ÓÃjavascript¶¯Ì¬Ìí¼Óɾ³ýhtmlÔªËØ</title>
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function $(nodeId) { 
return document.getElementById(nodeId); 

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return document.getElementsByTagName(tagName); 

function replaceMsg() { 
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function removeMsg() { 
var node = $("p2");//p±êÇ© 
var nodeBtn = $("remove");//°´Å¥ 
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document.body.removeChild(node);//ÔÚbodyÖÐɾ³ýidΪP2µÄÔªËØ 
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document.body.removeChild(nodeBtn); 
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function addbefore() { 
var newNode = document.createElement("p");//´´½¨P±êÇ© 
//var newText = document.createTextNode("Ç°ÃæÌí¼ÓµÄÔªËØ"); 
//newNode.appendChild(newText);//ÓëÏÂÃæЧ¹ûÒ»Ñù 
newNode.innerHTML = "<font color='red'>Ç°ÃæÌí¼ÓµÄÔªËØ</font>";//ÊéдP±êÇ©ÀïÃæµÄÄÚÈÝ 
var oldNode = $("p3");//Ä¿±ê±êÇ© 
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oldNode.parentNode.insertBefore(newNode,oldNode);//ÔÚÄ¿±ê±êÇ©Ç°ÃæÌí¼ÓÔªËØ 

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newNode.innerHTML = "<font color='red'>ºóÃæÌí¼ÓµÄÔªËØ</font>"; 
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