事半功倍系列之javascript

时间:2010-04-04 13:45:37  来源:第二电脑网  作者:第二电脑网

  第二电脑网导读:量和数组1.声明变量<script language=javascripe>Var answer1,answer2,answer3,answer4;answer1=9;answer2=2.5answer3="Milkey May" answer4=true</script>2.使用整数<script language=JavaScript>var decimalNum,hexadecimalNum,octalNumdecimalNum=24hexadecimalNum=0...
  正文:

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" 《事半功倍系列之javascript》由第二电脑网原创提供,转载请注明:http://www.002pc.com/master/College/Programming/JavaScript/13462.html

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