第一章javascript简介

1.在地址栏输入javascript语句

Javascriptocument.write("显示文字")

2.将javascript嵌入 HTML文档

<script language=javascript>
document.bgColor="blue"
</script>

第二章 使用变量和数组
1.声明变量

<script language=javascripe>
Var answer1,answer2,answer3,answer4;
answer1=9;
answer2=2.5
answer3="Milkey May"
answer4=true
</script>

2.使用整数

<script language=javascript>
var decimalNum,hexadecimalNum,octalNum
decimalNum=24
hexadecimalNum=0x24
octalNum=024
document.write("显示十进制数："+ decimalNum+"
")
document.write("显示十六进制数："+ hexadecimalNum +"
")
document.write("显示八进制数："+ octalNum +"
")
</script>

3.使用浮点数

<script language=javascript>
var num1,num2,num3,num4
num1=1234567890000.0
num2=5.14e23
num3=0.0000123456
num4=6.0254e3-4
document.write("浮点数1："+num1+"
")
document.write("浮点数2："+num2+"
")
document.write("浮点数3："+num3+"
")
document.write("浮点数4："+num4+"
")
</script>

4.使用布尔值

<script language=javascript>
var answer1,answer2
answer1=true
answer2=false
document.write("显示布尔1："+answer1+"
")
document.write("显示布尔2："+answer2+"
")
</script>

5.使用字符串

<script language=javascript>
var str1,str2
str1="fdsgdg dsfdsf china"
str2="武汉市广播电视大学"
document.write("显示字符串1："+str1+"
")
document.write("显示字符串2："+str2+"
")
</script>

6.确定变量类型

<script>
var answer1,answer2,answer3,answer4
answer1=9
answer2=2.5
answer3="milky may"
answer4=true
document.write("变量1的类型是："+typeof answer1 +"
")
document.write("变量2的类型是："+typeof answer2 +"
")
document.write("变量3的类型是："+typeof answer3 +"
")
document.write("变量4的类型是："+typeof answer4 +"
")
</script>

7.将字符串转换成数字

<script>
var str1="31 days in january"
var int1=parseInt(str1)
document.write("str1的数据类型是 ："+typeof str1+"
")
document.write("int1的数据类型是 ："+typeof int1+"
")
</script>

8.将数字转换成字符串
<script>
var int1=256
var str1=""+int1
document.write("str1的数据类型是 ："+typeof str1+"
")
document.write("int1的数据类型是 ："+typeof int1+"
")
</script>

9.声明数组

<script>
array=new Array(5)
array[0]=1
array[1]=3
array[2]=5
array[3]=7
array[4]=11
document.write("数组是："+array[0]+"
"+array[1]+"
"+array[2]+"
"+array[3]+"
"+array[4])
</script>

10.确定数组元素的个数

<script>
array=new Array(5)
array[0]=1
array[1]=3
array[2]=5
array[3]=7
array[4]=11
document.write("数组是："+array[0]+"
"+array[1]+"
"+array[2]+"
"+array[3]+"
"+array[4]+"
")
document.write("数组的元素个数是"+array.length)
</script>

11.将数组转换为字符串

<script>
array=new Array()
array[0]="dark"
array[1]="apple"
array[2]="nebula"
array[3]="water"
str1=array.join()
str2=array.join("
")
document.write(str1+"
")
document.write(str2)
</script>

12.对数组排序

<script>
array=new Array()
array[0]="dark"
array[1]="apple"
array[2]="nebula"
array[3]="water"
str1=array.sort()
document.write(str1+"
")
</script>

第三章 创建表达式

1.使用算术运算符

<script>
var1=12
var2=10
varadd=var1+var2
varsub=var1-var2
varmult=var1*var2
vardiv=var1/var2
varmod=var1%var2
document.write("数据1是："+var1+"
")
document.write("数据2是："+var2+"
")
document.write("数据相加是："+varadd+"
")
document.write("数据相减是："+varsub+"
")
document.write("数据相乘是："+varmult+"
")
document.write("数据相除是："+vardiv+"
")
document.write("数据相除取余数是："+varmod+"
")
</script>

2.递增变量和递减变量

<script>
days=1
document.write("输出变量"+days+"
")
days++
document.write("递增后变量变为："+days)
</script>

3.创建比较表达式

<script>
daysofmonth=28
if(daysofmonth==28)
month="february"
document.write("days of month:"+daysofmonth+"
")
document.write("month:"+month)
</script>

4.创建逻辑表达式

<script>
dayofmonth=28
if(dayofmonth==28
|| dayofmonth==29)
month="february"
document.write("days of month:"+dayofmonth+"
")
document.write("month:"+month)
</script>

5.使用条件运算符

<script language="javascript">
stomach="hungry";
time="5:00";
(stomach=="hungry"&&time=="5:00") ? eat =
"dinner":eat="a snack";
document.write("输出结果"+eat);
</script>

6.识别数字

<script>
var1=24;
(isNaN(var1))?document.write("变量var1"+var1+"不是数字")ocument.write("变量var1"+var1+"是数字")
</script>

第四章 控制程序流程

1.使用IF –Else语句

<script>
month="december"
date=25
if(month=="december"
&& date==25)
document.write("今天是圣诞节,商店关门")
else
document.write("欢迎,您来商店购物")
</script>

2.使用for 循环

<script>
for (count=1;count<=10;count++)
document.write("输出第"+count+"句"+"
")
</script>

3.使用while循环

<script>
count=1
while(count<=15){
document.write("输出第"+count+"句"
+"
")
count++}
</script>
4.中断循环

<script>
count=1
while(count<=15){
count++
if(count==8)
break;
document.write("输出第"+count+"句"+"
")}
</script>

5.继续循环

<script>
count=1
while(count<=15){
count++
if(count==8)
continue;
document.write("输出第"+count+"句"+"
")}
</script>

6.使用javascript定时器

<script>
function rabbit()
{document.write("输出语句")
}
</script>
<body onload=window.setTimeout(rabbit(),5000)>

7.设置定期间隔

<script>
window.setInterval("document.form1.text2.value=document.form1.text1.value",3000)
</script>
<form name=form1>
<input type=text name=text1><br>
<input type=text name=text2><br>
</form>

8.清除超时和间隔

<script>
stop=window.setInterval("document.form1.text2.value=document.form1.text1.value",300)
</script>
<form name=form1>
<input type=text name=text1><br>
<input type=text name=text2><br>
<input type=button name=button1 value=" 清除超时和间隔" onclick=clearInterval(stop)>
</form>

第五章 使用函数

1.声明函数

<script>
function quote()
{ document.write("输出语句")
}
</script>

2.调用函数

<script>
function quote()
{ document.write("输出语句")
}
quote()
</script>

3.了解全局变量和局部变量

任何不用 var关键字声明的变量都是全局变量,任何在函数外声明的变量都是全局变量

4.将参数传送给函数

<script>
function f(item)
{document.write("输出参数"+item+"
")
}
f("fgdfgd")
f("参数二")
</script>

5.从函数返回值

<script>
function average(var1,var2,var3)
{ave=(var1+var2+var3)/3;
document.write("输出结果");
return ave;
}
document.write(average(34,56,78))
</script>

6.通过HTML链接调用函数

<script>
function quote(){
document.write(" 输出字符串")
}
</script>
<a href=javascript:quote()>通过HTML链接调用函数</a>
<a href=javascriptocument.write("输出字符")> 通过HTML链接调用函数,直接写javascript语句</a>

第六章 处理事件

1.检查鼠标单击

<form name=form1>
<input type=button name=button1 value=hello onclick=document.form1.button1.value='there'>
</form>

2.检测双击

<form name=form1>
<input type=button name=button1 value=hello onclick=document.form1.button1.value='你单击了按钮' ondblclick=document.form1.button1.value='你双击了该按钮'>
</form>

3.创建悬停按钮

<img src=go.gif onmouseover=document.images[0].src='go2.gif' onmouseout= document.images[0].src='go.gif'>

4.检测按键

<form name=form1>
<input type=text name=text1 value=hello onkeypress="if(window.event.keyCode=='100') document.form1.text1.value='你按了d键'">
</form>

5.设置焦点

<form name=form1>
<input type=text name=text1 value=hello
onfous=document.form1.text1.value='该文本框获得焦点'
onblur=document.form1.text1.value='该文本框失去焦点'>
</form>

6.检测下拉菜单选择

<form name=form1>
<select name=select1 size=4
onChange=document.form1.text1.value=document.form1.select1.value>
<option value="北京">北京</option>
<option value="上海">上海</option>
<option value="武汉">武汉</option>
<option value="天津">天津</option>
<option value="大连">大连</option>
</select>
<input tppe=text name=text1 value=hello>
</form>

7.创建网页加载和卸载信息

<body onload=document.form1.text1.value='页面加载完毕' onunload=alert('再见,欢迎再来')>
<form name=form1>
<input type=text name=text1 value="页面正在加载 ……">
</form>

第七章 使用对象

1.理解对象\属性和方法

<body bgcolor="green">
<script>
document.write("页面背景颜色是:"+document.bgColor)
document.write("页面前景颜色是:"+document.fgColor)
</script>

2.使用网页元素对象

<script>
</script>
<form name=form1>
<textarea name=ta1>dfgfdgfdhfdhdfdfgdf</textarea>
<input type=button value="选择文本" onclick=document.form1.ta1.select()>
<input type=button value="显示文本" onclick=document.write(document.form1.ta1.value)>
</form>

3.使用子对象


<form name=form1>
<input type=text name=text1 value=hello>
</form>
<script>
document.form1.text1.value="gdfgfd"
</script>

<form name=form1>
<input type=radio name=radio1>男
<input type=radio name=radio2>女
</script>
<script>
document.form1.radio1.checked=true
</script>

4.使用预定义对象

<script>
str1="dgdfgdfgdfhf固定法固定法功夫攻打法"
document.write(str1+"
")
str2=str1.substr(5)
document.write(str2+"
")
document.write("输出圆的面积:"+Math.PI*Math.pow(5.0,2))
</script>

5.创建新对象

<script>
today=new Date()
document.write("今天是"+(today.getMonth()+1)+"月"+today.getDate()+"日"+"
")
document.write("现在是:"+today.toLocaleString())
</script>

6.引用当前对象

<form name=form1>
<input type=text name=text1 value="dgdgdfgfd" onclick=this.select()>
</script>

7.查看对象属性

<script>
for(prop in window)
{document.write("window."+prop+"="+window[prop]+"
");}
for(prop2 in location)
{document.write("location."+prop2+"="+location[prop]+"
");}
</script>

8.使用Array对象

<script>
array=new Array(10)
array[0]="bark"
array[1]="apple"
array[2]="nebula"
array[3]="cookie"
array[4]="technology"
document.write("数组元素个数是"+array.Length+"
")
document.write("用 join将数组合并"+array.join("
")+"
")
document.write(" 数组排序"+array.sort())
</script>

9.使用 image 对象

<img src=**.gif alt="图片提示…." border=10>
<script>
document.write("图片提示是:"+document.images[0].alt+"
")
document.write("图片边框大小是:"+document.images[0].broder)
</script>

10.预加载图像

<script>
freddy=new Image()
freddy.src=freddy.gif
</script>
<body onload=document.images[0].src=freddy.src>
,<img src="blank.gif">
</body>

11.改变图像

<img src=freddy.gif><br>
<form name=form1>
<input type=button name=button1 value="改变图像" onclickd=document.images[0].src=dudjp.gif>
</form>

12.使用link和anchor对象

<a name=anchor1>锚点1<br>
<a href=http://www.microsoft.com>Microsoft</a><br>
<a href=http://www.sohu.com>sohu</a><br>
<a href=http://www.sina.com.cn>sina</a><br>
<script>
document.write("本页面共有"+document.links.length+"链接"+"
")
document.write("本页面共有"+document.anchors.length+"锚点"+"
")
document.write("第一个链接协议是"+document.links[0].protocol+"
")
document.write("第一个链接路径是"+document.links[0].pathnamel+"
")
document.write("第一个链接href是"+document.links[0].hrefl+"
")
</script>

13.改变链接

<a href =http://www.microsoft.com>link</a>
<form name=form1>
<input type=button name=button1 value="改变链接" onclick=document.links[0].href='http://www.sohu.com'>
</form>

14.使用history对象

<form name=form1>
<input type=button name=button1 value="向后返回2页" onclick=window.history.go(-2)>
</form>

第八章 使用窗口

1.在浏览器的状态栏上显示文本

<body onload=window.status="欢迎光临我的站点">
<a href=http://www.sohu.com>sohu</a>
</body>

2.改变背景色

<script>
document.bgColor="orange"
</script>

3.列举背景颜色

<body bgColor =green>
<script>
document.write("当前背景色是:"+document.bgColor)
</script>
</body>

4.改变文本和链接颜色

<script>
document.bgColor="orange"
document.fgColor="blue"
document.linkColor="red"
</script>
<h2>看看这段文本颜色</h2>
<a href=http://www.sohu.com>sohu</a>
</body>

5.改变文档标题

<script>
name="Mouse"
document.title="welcome to "+name+"'s House"
document.write(document.title)
</script>
6.显示修改日期

<script>
document.write("本页面最后修改时间是"+document.lastModified)
</script>

7.查看当前文档的URL

<script>
document.write("本页面的URL:"+document.URL)
</script>

8.查看引用页

<script>
document.write("本页面的引用页是"+document.referrer)
</script>

9.打开新的浏览器窗口

<script>
window.open("*.htm","title","width=200,height=400,resizable=yes")
</script>

10.关闭远程窗口


close.html:
<script>
document.write("正文")
</script>
<form name=form1>
<input type=button name=button1value="关闭" onclick=window.close()>
</form>

open.html
<script>
window.open("close.html","romote","width=200,height=400,resizable=yes")
</script>

11.打印窗口

<script>
document.write("正文")
</script>
<form name=form1>
<input type=button value=打印 onclick=window.print()>
</form>

12.移动窗口


<form name=form1>
水平方向<input type=text name=x value=20>
垂直方向<input type=text name=y value=50>
<input type=button value="移动窗口到…"onclick=window.moveTo(document.form1.x.value,document.form1.y.value)>
</form>

<form name=form1>
水平方向<input type=text name=x value=20>
垂直方向<input type=text name=y value=50>
<input type=button value="移动窗口"onclick=window.moveBy(document.form1.x.value,document.form1.y.value)>
</form>


13.改变窗口大小


<form name=form1>
水平方向<input type=text name=x value=200>
垂直方向<input type=text name=y value=500>
<input type=button value="改变窗口大小到….."onclick=window.resizeTo(document.form1.x.value,document.form1.y.value)>
</form>

<form name=form1>
水平方向<input type=text name=x value=200>
垂直方向<input type=text name=y value=500>
<input type=button value="改变窗口大小"onclick=window.resizeBy(document.form1.x.value,document.form1.y.value)>
</form>

14.用警告对话框通知用户

<script>
window.alert("welcome")
</script>

15.用提示对话框接受输入

<script>
name=window.prompt("输入姓名","姓名")
document.write(" 欢迎您:"+name+"来到这里")
</script>

16.用确认对话框使用户做出决定

<script>
like=window.confirm("你觉得好吗?")
if(like==true)
document.write("谢谢你的夸奖")
else
document.write("希望得到你的夸奖")
</script>

第九章 使用字符串

1.使用字符串对象

<script>
mystring="gdgdfgfddddaaaaaaaaaaaabbbbbbbbbbbbbbbbbvbhg.
"
document.write(mystring)
document.write(mystring.bold())
document.write(mystring.toUpperCase())
</script>

2.使用子字符串

<script>
str1="fdsf 1111 gfdgfd dfdsf cccc dddd.
"
document.write(str1)
document.write(str1.substring(0,13)+"
")
document.write(str1.substr (20,11)+"
")
</script>

3.连接字符串

<script>
str1="may you find"
str2="peace,happiness and prosperity.
"
document.write(str1+"
")
document.write(str2)
document.write(str1.concat(str2))
document.write(str1+=str2)
</script>

4.格式化字符串变量

<script>
str1="peace,happiness and prosperity.
"
document.write(str1)
document.write(str1.big())
document.write(str1.small())
document.write(str1.bold())
document.write(str1.italics())
document.write(str1.strike())
document.write(str1.fontsize(6))
document.write(str1.fontcolor(green))
</script>

5.创建锚和链接

<script>
str1="this is the bigginning of the page.
"
str2="….
"
str3="this is the end of the page .
"
str4="link to the start
"
str5="link to the end
"
document.write(str1.anchor("start"))
for(i=0;i<10;i++)
document.write(str2);
document.write(str3.anchor("end"))
document.write(str4.link("#start"))
document.write(str5.link("#end"))
</script>

6.确定字符串长度

<script>
str1="this is the bigginning of the page."
document.write(str1+"
")
document.write( "字符串的长度是:"+str1.length)
document.write("字符串全部大写是;"+str1.toUpperCase())
document.write("字符串全部小写是;"+str1.toLowerCase())
</script>

7.在字符串内搜索

<script>
str1="this is the end of the line.
"
document.write(str1)
document.write("字符end在字符串的位置是"+str1.search("end"))
document.write("字符dog在字符串的位置是"+str1.search("dog"))
</script>

8.定位字符串中的字符

<script>
str1="spring is a time for flowers and trees and baby bunnles
"
document.write(str1)
document.write("the index for the second word ‘and' is"+str1.indexOf("and",30))
documednt.write("the last index of the word ‘and' is "+str1.lastIndexOf("and"))
</script>

9.替换字符串中的文本
<script>
str1="spring is a time for flowers and trees and baby bunnles
"
document.write(str1)
document .write(str1.replace("and",","))
</script>

10.字符串分离

<script>
str1="spring is a time for flowers and trees and baby bunnles
"
document.write(str1)
str1array=str1.split("
")
document.write(str1array[0]+"
")
document.write(str1array[1]+"
")
document.write(str1array[2]+"
")
document.write(str1array[3]+"
")
</script>

第十章 使用日期和时间

1.使用Date对象

<script>
cdate=new Date("august 2,1989 12:30:00")
document.write(cdate)
</script>

2.显示当地时间和日期

<script>
cdate=new Date()
document.write("当前时间是:"+cdate.toGMTString()+"
")
document.write("日期和时间是:"+cdate.toLocaleString())
</script>

3.获得时间和日期值

<script>
cdate=new Date()
document.write("显示当前的星期"+cdate.getDay()+"
")
document.write("显示当前的月份"+cdate.getMonth()+"
")
document.write("显示当前的日期"+cdate.getDay()+"
")
document.write("显示当前的年份"+cdate.getYear()+"
")
document.write("显示当前的小时"+cdate.getHours()+"
")
document.write("显示当前的分钟"+cdate.getMinutes()+"
")
document.write("显示当前的秒"+cdate.getSeconds()+"
")
</script>

4.设置时间和日期值

<script language=javascript>
cdate=new Date("December 25,1984")
document.write("显示日期"+cdate+"
")
document.write("设置月份"+cdate.setMonth(10)+"
")
document.write("设置日期"+cdate.setDate(23)+"
")
document.write("设置年份"+cdate.setYear(2000)+"
")
document.write("设置小时"+cdate.setHours(13)+"
");
document.write("设置分钟"+cdate.setMinutes(47)+"
");
document.write("设置秒"+cdate.setSeconds(23)+"
");
document.write("显示设置后的日期和时间"+cdate);
</script>

第十一章 使用Math对象

1. 使用Math对象

<script language=javascript>
</script>
<form name=form1>
圆的半径:<input type=text name=rad><br>
圆的面积:<input type=text name=area><br>
<input type=button name=button1 value=计算圆的面积 onclick=document.form1.area.value=document.form1.rad.value*document.
form1.rad.value*Math.PI>
</form>

2.生成随机数

<script>
array1=new Array(
"这是第1句",
"这是第2句",
"这是第3句",
"这是第4句",
"这是第5句",
"这是第6句")
RandomNo=Math.floor(array1.length*Math.random())
document.write("随机输出某一句"+"
"+array1[RandomNo])
</script>

3.使用平方根

<form name=form1>
value:<input type=text name=va1><br>
平方根<input type=text name=sqrt><br>
<input type=button name=button1 value=计算平方根
onclick="document.form1.sqrt.value=Math.sqrt(document.form1.va1.value)">
</form>

4.数字的舍入

<form name=form1>
输入<input type=text name=val><br>
舍入的结果<input type=text name=round><br>
<input type=button name=button1 value=计算结果 onclick=document.form1.round.value=Math.round(document.form1.val.value)>
</form>

5.乘方运算

<form name=form1>
底数<input type=text name=val><br>
指数<input type=text name=power><br>
幂<input type=text name=result><br>
<input type=button name=button1 value=计算结果 onclick="document.form1.result.value=Math.pow (document.form1.val.value,document.form1.power.value)">
</form>

6.发现最小值和最大值

<form name=form1>
数字1<input type=text name=val1><br>
数字2<input type=text name=val2><br>
最小值<input type=text name=min><br>
最大值<input type=text name=max><br>
数字1<input type=button value=计算 onclick="document.form1.min.value=Math.min (document.form1.val1.value,document.form1.val2.value);document.form1.
max.value= Math.max(document.form1.val1.value,document.form1.val2.value)">
</form>

第十二章 使用表单

1.使用文本框


<form name=form1>
<input type=text value="information ,please"name=text1>
</form>
<script>
document.write("表单text1类型是: "+document.form1.text1.type+"
")
document.write("表单text1名称是: "+document.form1.text1.name+"
")
document.write("表单text1值是: "+document.form1.text1.value+"
")
document.write("表单text1大小是: "+document.form1.text1.size+"
")
</script>

<form name=form1>
<input type=text name=text1 value=click here
onfocus=document.form1.text1.select()>
</form>

2.使用密码框

<form name=form1>
<input type=password name=pw1 value=daylight>
</form>
<script>
document.write("表单pw1的类型:"+document.form1.pw1.type+"
")
document.write("表单pw1的名称:"+document.form1.pw1.name+"
")
document.write("表单pw1的值:"+document.form1.pw1.value+"
")
document.write("表单pw1的大小:"+document.form1.pw1.size+"
")
</script>

3.使用隐藏字段

<form name=form1>
<input type=hidden name=hid1 value=piece of eight>
</form>
<script>
document.write("表单hid1的类型:"+document.form1.hid1.type+"
")
document.write("表单hid1的名称:"+document.form1.hid1.name+"
")
document.write("表单hid1的值:"+document.form1.hid1.value+"
")
</script>

4.使用文本区域框


<form name=form1>
<textarea name=ta1>how many grains of sand are there in the sahara desert?</textarea>
</form>
<script>
document.write("表单ta1的类型:"+document.form1.ta1.type+"
")
document.write("表单ta1的名称:"+document.form1.ta1.name+"
")
document.write("表单ta1的值:"+document.form1.ta1.value+"
")
document.write("表单ta1的横向宽度:"+document.form1.ta1.cols+"
")
document.write("表单ta1的纵向宽度:"+document.form1.rows.value+"
")
</script>

6.使用重置按钮

<form name=form1>
<input type=reset name=reset1 value="rest form">
</form>
<script>
document.write("表单reset1的类型:"+document.form1.reset1.type+"
")
document.write("表单reset1的名称:"+document.form1.reset1.name+"
")
document.write("表单reset1的值:"+document.form1.reset1.value+"
")
</script>

7.使用提交按钮

<form name=form1>
<input type=submit name=submit1 value="submit form">
</form>
<script>
document.write("表单submit1的类型:"+document.form1.submit1.type+"
")
document.write("表单submit1的名称:"+document.form1.submit1.name+"
")
document.write("表单submit1的值:"+document.form1.submit1.value+"
")
</script>

8.使用复选按钮

<form name=form1>
<input type=checkbox name=cb1 >computer savvy?
</form>
<script>
document.write("表单cb1的类型:"+document.form1.cb1.type+"
")
document.write("表单cb1是否被选择?:"+document.form1.cb1.checked+"
")
document.write("表单cb1的名称:"+document.form1.cb1.name+"
")
</script>

9.使用单选按钮

<form name=form1>
<input type=radio name=radio1>male
<input type=radio name=radio1>female
</form>
<script>
document.write("第一个按钮被选择"+document.form1.radio1[0].checked+"
")
document.write("第二个按钮被选择"+document.form1.radio1[1].checked+"
")
document.write("按钮的名称"+ document.form1.radio1[0].name+"
")
document.write("按钮的个数"+document.form1.radio1.length)
</script>

10.使用选择列表

<form name=form1>
<select name=select1 size=4>
<option name=option1 value=lon>london,England</option>
<option name=option2 value=dub>Dublin,Ireland</option>
</select>
</form>
<script>
document.write("这个选择列表的名称"+document.form1.select1.name+"
")
document.write("这个选择列表的长度"+document.form1.select1.length+"
")
document.write("这个选择列表当前被选择的索引号"+document.form1.select1.selectedIndex+"
")
document.write("这个选择列表的尺寸"+document.form1.select1.size+"
")
</script>

11.验证表单的有效性

<script>
function validate(){
if(document.form1.text1.value!='1'||'2'||'3'||'4'){
alert("请输入1~4的整数")
}
}
</script>
<form name=form1>
请输入1~4的整数:
<input type=text name=text1 size=4 onchange=validate()>
</form>

12.控制表单焦点

<form name=form1>
<input type=text name=text1 value=where is you focus?><br>
<input type=text name=text2 value=is there?><br>
<input type=text name=text3 value=or maybe here?><br>
<input type=button name=button1 value="text box #1" onclick=document.form1.text1.focus()><br>
<input type=button name=button2 value="text box #2" onclick=document.form1.text2.focus()><br>
<input type=button name=button3 value="text box #3" onclick=document.form1.text3.focus()><br>
</form>

第十三章 使用分栏

第十四章 使用navigator

1.使用navigator对象

<script>
document.write("navigator对象的属性"+"
")
document.write("appcodename:"+navigator.appCodeName+"
")
document.write("appname::"+navigator.appName+"
")
document.write("appversion:"+navigator.appVersion+"
")
document.write("platform:"+navigator.platform+"
")
document.write("userAgent:"+navigator.userAgent+"
")
</script>
<script>
document.write("navigator对象的方法"+"
")
document.write("javaEnabled():"+navigator.javaEnabled())
</script>

2.检查用户的浏览器

<script>
if(navigator.appName.indexOf("Microsoft")!=-1){
document.write("用户浏览器是微软的IE浏览器"+"
")}
else
if(navigator.appName.indexOf("Netscape")!=-1){
document.write("用户浏览器是netscape的netscape浏览器"+"
")}
if(navigator.appVersion.indexOf("4.0")!=-1){
document.write("you are using a version 4.0compatible browser")
}
else{
document.write("this browser is not 4.0 compliant")}
</script>

3.检测用户的操作系统

<script>
if (navigator.platform.indexOf("win32")!=-1){
document.write("you are using a computer running windows 95 or highter")}
else{
document.write("this computer is not running windows 95 or higher")}
</script>

4.使用location对象


<script>
document.write("location对象的属性"+"
")
document.write("hash"+location.hash+"
")
document.write("hostname"+location.hostname+"
")
document.write("host"+location.host+"
")
document.write("href"+location.href+"
")
document.write("port"+location.port+"
")
document.write("search"+location.search+"
")
</script>

重新加载网页
<form name=form1>
<input type=button name=button1 value=重新加载本页 onclick=location.reload>
</form>


5.使用cookie


<script>
finction makecookie(){
if(!document.cookie){
name=prompt("请输入你的姓名");
document.cookie="name="+name+";";}
}
</script>

<body onload=makecookie()>
<script>
function makecookie(){
if(!document.cookie){
name=prompt("请输入你的姓名")
document.cookie="name="+name+";";
namestart=document.cookie.indexOf("=");
nameend=document.cookieindexOf(";");
document.writeln("your name is:"+document.cookie.substring(namestart+1,nameend)+",br>")
}
}
</script>