js操作DOM--添加、删除节点的简单实例
时间:2021-08-15 09:33:49|栏目:JavaScript代码|点击: 次
js removeChild() 用法 <body> <p id="p1">welcome to <b>javascript</b> world !</p> <script language="javascript" type="text/javascript"> <!-- function nodestatus(node) { var temp=""; if(node.nodeName!=null) { temp+="nodeName="+node.nodeName+"\n"; } else temp+="nodeName=null \n"; if(node.nodeType!=null) { temp+="nodeType="+node.nodeType+"\n"; } else temp+="nodeType=null \n"; if(node.nodeValue!=null) { temp+="nodeValue="+node.nodeValue+"\n"; } else temp+="nodeValue=null \n"; return temp; } var parent=document.getElementById("p1"); var msg="父节点 \n"+nodestatus(parent)+"\n"; //返回元素节点p的最后一个孩子 last=parent.lastChild; msg+="删除之前:lastChild--"+nodestatus(last)+"\n"; //删除节点p的最后一个孩子,变为b parent.removeChild(last); last=parent.lastChild; msg+="删除之后:lastChild--"+nodestatus(last)+"\n"; alert(msg); --> </script> </body>
<html> <head> <title>js控制添加、删除节点</title> </head> <script type="text/javascript"> var all; function addParagraph() { all = document.getElementById("paragraphs").childNodes; var newElement = document.createElement("p"); var seq = all.length + 1; //创建新属性 var newAttr = document.createAttribute("id"); newAttr.nodeValue = "p" + seq; newElement.setAttribute(newAttr); //创建文本内容 var txtNode = document.createTextNode("段落" + seq); //添加节点 newElement.appendChild(txtNode); document.getElementById("paragraphs").appendChild(newElement); } function delParagraph() { all = document.getElementById("paragraphs").childNodes; document.getElementById("paragraphs").removeChild(all[all.length -1]); } </script> <style> p{ background-color : #e6e6e6 ; } </style> <body> <center> <input type="button" value="添加节点" onclick="addParagraph();"/> <input type="button" value="删除节点" onclick="delParagraph();"/> <div id="paragraphs"> <p id="p1">段落1</p> <p id="p2">段落2</p> </div> </center> </body> </html>
栏 目:JavaScript代码
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