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事半功倍之js

事半功倍之js

第一章javascript简介

1.在地址栏输入javascript语句

Javascript:Document.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+"<br>")
document.write("显示十六进制数:"+ hexadecimalNum +"<br>")
document.write("显示八进制数:"+ octalNum +"<br>")
</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+"<br>")
document.write("浮点数2:"+num2+"<br>")
document.write("浮点数3:"+num3+"<br>")
document.write("浮点数4:"+num4+"<br>")
</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+"<br>")
document.write("显示布尔2:"+answer2+"<br>")
</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+"<br>")
document.write("显示字符串2:"+str2+"<br>")
</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 +"<br>")
document.write("变量2的类型是:"+typeof answer2 +"<br>")
document.write("变量3的类型是:"+typeof answer3 +"<br>")
document.write("变量4的类型是:"+typeof answer4 +"<br>")
</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+"<br>")
document.write("int1的数据类型是 :"+typeof int1+"<br>")
</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+"<br>")
document.write("int1的数据类型是 :"+typeof int1+"<br>")
</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]+"<br>")
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+"<br>")
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+"<br>")
</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+"<br>")
document.write("数据2是:"+var2+"<br>")
document.write("数据相加是:"+varadd+"<br>")
document.write("数据相减是:"+varsub+"<br>")
document.write("数据相乘是:"+varmult+"<br>")
document.write("数据相除是:"+vardiv+"<br>")
document.write("数据相除取余数是:"+varmod+"<br>")
</script>

2.递增变量和递减变量

<script>
days=1
document.write("输出变量"+days+"<br>")
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+"<br>")
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+"<br>")
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"):Document.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"+"<br>")
</script>
梦醒的地方就是梦开始的地方

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3.使用while循环

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

5.继续循环

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

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+"<br>")
str2=str1.substr(5)
document.write(str2+"<br>")
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"+"<br>")
document.write("现在是:"+today.toLocaleString())
</script>
梦醒的地方就是梦开始的地方

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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]+"<br>");}
for(prop2 in location)
{document.write("location."+prop2+"="+location[prop]+"<br>");}
</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+"<br>")
document.write("用 join将数组合并"+array.join(" ")+"<br>")
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+"<br>")
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"+"<br>")
document.write("本页面共有"+document.anchors.length+"锚点"+"<br>")
document.write("第一个链接协议是"+document.links[0].protocol+"<br>")
document.write("第一个链接路径是"+document.links[0].pathnamel+"<br>")
document.write("第一个链接href是"+document.links[0].hrefl+"<br>")
</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>



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

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

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

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>



<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>



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>
梦醒的地方就是梦开始的地方

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第九章 使用字符串

1.使用字符串对象

<script>
mystring="gdgdfgfddddaaaaaaaaaaaabbbbbbbbbbbbbbbbbvbhg.<br>"
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.<br>"
document.write(str1)
document.write(str1.substring(0,13)+"<br>")
document.write(str1.substr (20,11)+"<br>")
</script>

3.连接字符串

<script>
str1="may you find"
str2="peace,happiness and prosperity.<br>"
document.write(str1+"<br>")
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.<br>"
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.<br>"
str2="….<br>"
str3="this is the end of the page .<br>"
str4="link to the start<br>"
str5="link to the end<br>"
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+"<br>")
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.<br>"
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<br>"
document.write(str1)
document.write("the index for the second word ‘and' is"+str1.indexOf("and",