1.有如下html，如果用js获得被选中的option的text描述（非value）<select id="select_id"> <option vlue="1">text1</option> <option vlue="2">text2</option> <option vlue="3">text3</option> <option vlue="4">text4</option></select>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <select id="select_id"> <option value="text1">text1</option> <option value="text2">text2</option> <option value="text3">text3</option> </select> <script> var obj=document.getElementById("select_id"); //获取select元素 obj.onchange=function(){ for(var i=0;i<obj.options.length;i++){ if(obj.options[i].selected) alert(obj.options[i].text); //输出被选项的文本信息 } } </script> </body> </html>2.有如下html，如何用js取得month的值<form id="form_id"><input type="radio" name="month"value=1 /><input type="radio" name="month"value=2 /><input type="radio" name="month"value=3 /><input type="radio" name="month"value=4 /></form>
3.有如下html，如何通过Dom方法来取得最后一个p的text<html> <head> <title>DOM Example</title> </head> <body> <p>Hello World!</p> <p>Isn'T this exciting!<p> <p>You're learning to ues ths DOM!</p></body></html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <p>Hello World!</p> <p>Isn'T this exciting!<p> <p>You're learning to ues ths DOM!</p> <script> var obj=document.getElementsByTagName("p"); var txt=obj[obj.length-1].innerHTML||obj[obj.length-1].textContent; //IE与Firefox浏览器兼容 alert(txt); </script> </body> </html>4..要用标准dom方法来动态在页面body中加入如下html，该如何做？<p id="pl">hello world</p>
<script> var p=document.createElement("p"); //创建元素节点 var txt=document.createTextNode("hello world!"); //创建文本节点 p.appendChild(txt); // 将文本节点添加到新创建元素中 document.body.appendChild(p); //将添加了文本的元素添加到页面中 </script>
转载于:https://www.cnblogs.com/duduSunny/p/4123789.html
相关资源：js_HTML_Dom操作练习