课程 \
JavaScript进阶篇
9-22 编程练习
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script type="text/javascript">
window.onload = function(){
// 鼠标移动改变背景,可以通过给每行绑定鼠标移上事件和鼠标移除事件来改变所在行背景色。
var tr=document.getElementsByTagName("tr");
for(var i= 0;i<tr.length;i++)
{
tr[i].onmouseover=function(){
this.style.backgroundColor="#f2f2f2";}
tr[i].onmouseout=function(){
this.style.backgroundColor="#fff";}
}
}
// 编写一个函数，供添加按钮调用，动态在表格的最后一行添加子节点；
// 创建删除函数
function del(item)
{
var tr=item.parentNode.parentNode;
tr.parentNode.removeChild(tr);
}
</script>
</head>
<body>
<table border="1" width="50%" id="table">
<tr>
<th>学号</th>
<th>姓名</th>
<th>操作</th>
</tr>
<tr>
<td>xh001</td>
<td>王小明</td>
<td><a href="javascript:;" >删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
<tr>
<td>xh002</td>
<td>刘小芳</td>
<td><a href="javascript:;" onclick="del(this);">删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
</table>
<input type="button" value="添加一行" /> <!--在添加按钮上添加点击事件 -->
</body>
</html>
2015-05-06
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9-21 网页卷去的距离与偏移量
<!DOCTYPE HTML>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
function req(){
var div = document.getElementById("div1");
document.getElementById("li1").innerHTML = (div.offsetTop)+"px";//div1距离屏幕顶部的距离
document.getElementById("li2").innerHTML = (div.offsetLeft)+"px";//div1距离屏幕左部的距离
document.getElementById("li3").innerHTML = (div.scrollTop)+"px";//div1纵向滚动条滚动的距离
document.getElementById("li4").innerHTML = (div.scrollLeft)+"px";//div1横向滚动条滚动的距离
}
</script>
</head>
<body style="border:10px solid #ccc;padding:0px 0px;margin:5px 10px">
<div style="width:60%;border-right:1px dashed red;float:left;">
<div style="float:left;">
<div id="div1" style="border:5px red solid;height:300px;width:200px;overflow:auto">
<div style="height:500px;width:400px">请调整横竖滚动条后，点击按钮后查看offsetTop、offsetLeft、scrollTop、scrollLeft值。</div>
</div>
<input type="button" value="点击我!" onclick="req()" style="border: 1px solid purple;height: 25px;"/>
</div>
</div>
<div style="width:30%;float:left;">
<ul style="list-style-type: none; line-height:30px;">结果：
<li>offsetTop : <span id="li1"></span></li>
<li>offsetLeft : <span id="li2"></span></li>
<li> scrollTop : <span id="li3"></span></li>
<li>scrollLeft : <span id="li4"></span></li>
</ul>
</div>
<div style="clear:both;"></div>
</body>
</html>
2015-05-05
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9-20 网页尺寸offsetHeight
<!DOCTYPE HTML>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script type="text/javascript">
var width=document.documentElement.offsetWidth||document.body.offsetWidth;
var height=document.documentElement.offsetHeight||document.body.offsetHeight;
document.write("offsetWidth="+width+"<br>");
document.write("offsetHeight="+height);
</script>
</body>
</html>
2015-05-05
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9-19 网页尺寸scrollHeight
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script type="text/javascript">
var width=document.documentElement.scrollWidth||document.body.scrollWidth;
var height=document.documentElement.scrollHeight||document.body.scrollHeight;
document.write("scrollWidth="+width+"<br>");
document.write("scrollHeight="+height);
</script>
</body>
</html>
2015-05-05
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9-18 浏览器窗口可视区域大小
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script type="text/javascript">
var width=document.documentElement.clientWidth||document.body.clientWidth;
var height=document.documentElement.clientHeight||document.body.clientHeight;
document.write("Width="+width+"<br>");
document.write("Height="+height);
</script>
</body>
</html>
2015-05-05
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9-17 创建文本节点createTextNode
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style type="text/css">
.message{
width:200px;
height:100px;
background-color:#CCC;}
</style>
</head>
<body>
<script type="text/javascript">
var element=document.createElement("p");
element.className="message";
var textNode=document.createTextNode("I love JavaScript!");
element.appendChild(textNode);
document.body.appendChild(element);
</script>
</body>
</html>
2015-05-05
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9-16 创建元素节点createElement
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
var main = document.body;
//创建链接
function createa(url,text)
{
var body=document.body;
var a=document.createElement("a");
a.href=url;
a.innerHTML=text;
a.style.color="green";
body.appendChild(a);
}
// 调用函数创建链接
createa("http://www.imooc.com","慕课网");
</script>
</body>
</html>
2015-05-05
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9-15 替换元素节点replaceChild()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div><b id="oldnode">JavaScript</b>是一个很常用的技术，为网页添加动态效果。</div>
<a href="javascript:replaceMessage()"> 将加粗改为斜体</a>
<script type="text/javascript">
function replaceMessage(){
var oldNode=document.getElementById("oldnode");
var oldHTML=oldNode.innerHTML;
var newnode=document.createElement("i");
oldNode.parentNode.replaceChild(newnode,oldNode);
newnode.innerHTML=oldHTML;
}
</script>
</body>
</html>
2015-05-05
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9-14 删除节点removeChild()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div id="content">
<h1>html</h1>
<h1>php</h1>
<h1>javascript</h1>
<h1>jquery</h1>
<h1>java</h1>
</div>
<script type="text/javascript">
function clearText() {
var content=document.getElementById("content");
// 在此完成该函数
for(var i=content.childNodes.length-1;i>=0;i--){
var chnode=content.childNodes[i];
content.removeChild(chnode);
}
}
</script>
<button onclick="clearText()">清除节点内容</button>
</body>
</html>
2015-05-05
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9-13 插入节点insertBefore()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<ul id="test"><li>JavaScript</li><li>HTML</li></ul>
<script type="text/javascript">
var otest = document.getElementById("test");
var newnode=document.createElement("li");
newnode.innerHTML="php";
otest.insertBefore(newnode,otest.childNodes[1]);
</script>
</body>
</html>
2015-05-05
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9-12 插入节点appendChild()
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<ul id="test">
<li>JavaScript</li>
<li>HTML</li>
</ul>
<script type="text/javascript">
var otest = document.getElementById("test");
var newnode=document.createElement("li");
newnode.innerHTML="PHP";
otest.appendChild(newnode);
</script>
</body>
</html>
2015-05-05
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9-11 访问兄弟节点
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>nextSibling</title>
</head>
<body>
<ul id="u1">
<li id="a">javascript</li>
<li id="b">jquery</li>
<li id="c">html</li>
</ul>
<ul id="u2">
<li id="d">css3</li>
<li id="e">php</li>
<li id="f">java</li>
</ul>
<script type="text/javascript">
function get_nextSibling(n){
var x=n.nextSibling;
while (x && x.nodeType!=1){
x=x.nextSibling;
}
return x;
}
function get_previousSibling (n){
var x=n.previousSibling;
while (x && x.nodeType!=1){
x=x.previousSibling;
}
return x;
}
var x=document.getElementsByTagName("li")[0];
document.write(x.nodeName+"="+x.innerHTML+"<br>");
var y=get_nextSibling(x);
if(y!=null){
document.write("nextsibling: "+y.nodeName+"="+y.innerHTML+"<br>");
}else{
document.write("已经是最后一个节点<br>");
}
var x=document.getElementsByTagName("li")[1];
document.write(x.nodeName+"="+x.innerHTML+"<br>");
var y=get_previousSibling(x);
if(y!=null){
document.write("previousSibling: "+y.nodeName+"="+y.innerHTML+"<br>");
}else{
document.write("已经是第一个节点");
}
</script>
</body>
</html>
2015-05-05
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9-10 访问父节点parentNode
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<ul id="con">
<li id="lesson1">javascript
<ul>
<li id="tcon"> 基础语法</li>
<li>流程控制语句</li>
<li>函数</li>
<li>事件</li>
<li>DOM</li>
</ul>
</li>
<li id="lesson2">das</li>
<li id="lesson3">dadf</li>
<li id="lesson4">HTML/CSS
<ul>
<li>文字</li>
<li>段落</li>
<li>表单</li>
<li>表格</li>
</ul>
</li></ul>
<script type="text/javascript">
var mylist = document.getElementById("tcon");
document.write(mylist.parentNode.parentNode.parentNode.lastChild.innerHTML);
</script>
</body>
</html>
2015-05-04
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9-9 访问子节点的第一和最后项
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div id="con"><p>javascript</p><div>jQuery</div><h5>PHP</h5></div>
<script type="text/javascript">
var x=document.getElementById("con");
document.write("第一个子节点:"+x.firstChild.nodeName+"<br>");
document.write("最后一个子节点:"+x.lastChild.nodeName);
</script>
</body>
</html>
2015-05-04
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9-8 访问子节点childNodes
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div>
javascript
<p>javascript</p>
<div>jQuery</div>
<h5>PHP</h5>
</div>
<script type="text/javascript">
var x=document.getElementsByTagName("div")[0].childNodes;
for(i=0;i<x.length;i++)
document.write("节点"+(i+1)+"属性：名称"+x[i].nodeName+"、值"
+x[i].nodeValue+"、类型"+x[i].nodeType+"<br>");
</script>
</body>
</html>
2015-05-04
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9-7 节点属性
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>节点属性</title>
</head>
<body>
<ul>
<li>javascript</li>
<li>HTML/CSS</li>
<li>jQuery</li>
</ul>
<script type="text/javascript">
var myli=document.getElementsByTagName("li");
for(i=0;i<myli.length;i++)
{
document.write(myli[i].nodeName+"<br>");
document.write(myli[i].nodeValue+"<br>");
document.write(myli[i].nodeType+"<br>");
}
</script>
</body>
</html>
2015-04-26
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9-6 setAttribute()方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<p id="intro">我的课程</p>
<ul>
<li title="JS">JavaScript</li>
<li title="JQ">JQuery</li>
<li title="">HTML/CSS</li>
<li title="JAVA">JAVA</li>
<li title="">PHP</li>
</ul>
<h1>以下为li列表title的值,当title为空时，新设置值为"WEB前端技术":</h1>
<script type="text/javascript">
var Lists=document.getElementsByTagName("li");
for (var i=0; i<Lists.length;i++)
{
var text=Lists[i].getAttribute("title");
document.write(text +"<br>");
if(text=="")
{
Lists[i].setAttribute("title","WEB前端技术");
document.write(Lists[i].getAttribute("title")+"<br>");
}
}
</script>
</body>
</html>
2015-04-26
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9-5 getAttribute()方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>getAttribute()</title>
</head>
<body>
<p id="intro">课程列表</p>
<ul>
<li title="第1个li">HTML</li>
<li>CSS</li>
<li title="第3个li">JavaScript</li>
<li title="第4个li">Jquery</li>
<li>Html5</li>
</ul>
<p>以下为获取的不为空的li标签title值:</p>
<script type="text/javascript">
var con=document.getElementsByTagName("li");
for (var i=0; i< con.length;i++){
var text=con[i].getAttribute("title");
if(text!=null)
{
document.write(text+"<br>");
}
}
</script>
</body>
</html>
2015-04-26
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9-4 区别getElementByID,getElementsByName,getElementsByTagName
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<form>
请选择你爱好:<br>
<input type="checkbox" name="hobby" id="hobby1"> 音乐
<input type="checkbox" name="hobby" id="hobby2"> 登山
<input type="checkbox" name="hobby" id="hobby3"> 游泳
<input type="checkbox" name="hobby" id="hobby4"> 阅读
<input type="checkbox" name="hobby" id="hobby5"> 打球
<input type="checkbox" name="hobby" id="hobby6"> 跑步 <br>
<input type="button" value = "全选" onclick = "checkall();">
<input type="button" value = "全不选" onclick = "clearall();">
<p>请输入您要选择爱好的序号，序号为1-6:</p>
<input id="wb" name="wb" type="text" >
<input name="ok" type="button" value="确定" onclick = "checkone();">
</form>
<script type="text/javascript">
function checkall(){
var hobby = document.getElementsByTagName("input");
// 任务1
for(i=0;i<hobby.length;i++)
{
if(hobby[i].type=="checkbox")
{
hobby[i].checked=true;
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
// 任务2
for(i=0;i<hobby.length;i++)
{
if(hobby[i].type=="checkbox")
{
hobby[i].checked=false;
}
}
}
function checkone(){
var j=document.getElementById("wb").value;
// 任务3
document.getElementById("hobby"+j).checked=true;
}
</script>
</body>
</html>
2015-04-26
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9-3 getElementsByTagName()方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>JavaScript</title>
</head>
<body>
<form name="Input">
<table align="center" width="500px" height="50%" border="1">
<tr>
<td align="center" width="100px">
学号:
</td>
<td align="center" width="300px">
<input type="text" id=userid name="user" onblur="validate();">
<div id=usermsg></div>
</td>
</tr>
<tr>
<td align="center" width="100px">
姓名:
</td>
<td align="center">
<input type="text" name="name">
</td>
</tr>
<tr>
<td align="center" width="%45">
性别:
</td>
<td align="center">
<input type="radio" name="sex" value="男">
男
<input type="radio" name="sex" value="女">
女
</td>
</tr>
<tr>
<td align="center" width="30%">
年龄:
</td>
<td align="center" width="300px">
<input type="text" name="age">
</td>
</tr>
<tr>
<td align="center" width="100px">
地址:
</td>
<td align="center" width="300px">
<input type="text" name="addr">
</td>
</tr>
</table>
</form>
<h1 id="myHead" onclick="getValue()">
看看三种获取节点的方法?
</h1>
<p>
点击标题弹出它的值。
</p>
<input type="button" onclick="getElements()"
value="看看name为sex的节点有几个?" />
<Br>
<input type="button" onclick="getTagElements()"
value="看看标签名为input的节点有几个?" />
<script type="text/javascript">
function getValue()
{
var myH=document.getElementById("myHead");
alert(myH.innerHTML)
}
function getElements()
{
var myS=document.getElementsByName("sex");
alert(myS.length);
}
function getTagElements()
{
var myI=document.getElementsByTagName("input");
alert(myI.length);
}
</script>
</body>
</html>
2015-04-26
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