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事半功倍之Javascript (1)

摘要: 事半功倍之Javascript (1)
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本文由经典论坛 邓永炎 整理

清华大学出版的《事半功倍系列 javascript》,本人照着书敲出来的,有些翻译了一下.前几年看了一下,最近无事,重新翻了翻,很有帮助.本书应该有光盘的,但学校的书,光盘不知在哪.希望对你学 javascript有帮助

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+"
")
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"):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"+"
")
</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>

<input type=text name=text2>

</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>

<input type=text name=text2>

<input type=button name=button1 value=" 清除超时和间隔" onclick=clearInterval(stop)>
</form>

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