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事半功倍系列 javascript

 第一章javascript簡介

1.在地址欄輸入javascript語句

Javascript:Document.write("顯示文字")

2.將javascript嵌入 HTML文檔

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

第二章 使用變量和數組

1.聲明變量

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

2.使用整數

<script language=javascript>
var decimalNum,hexadecimalNum,octalNum
decimalNum=24
hexadecimalNum=0x24
octalNum=024
document.write("顯示十進制數:"+ decimalNum+"<br>")
document.write("顯示十六進制數:"+ hexadecimalNum +"<br>")
document.write("顯示八進制數:"+ octalNum +"<br>")
</script>

3.使用浮點數

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

4.使用布爾值

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

5.使用字符串

<script language=javascript>
var str1,str2
str1="fdsgdg dsfdsf china"
str2="武漢市廣播電視大學"
document.write("顯示字符串1:"+str1+"<br>")
document.write("顯示字符串2:"+str2+"<br>")
</script>

6.確定變量類型

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

7.將字符串轉換成數字

<script>
var str1="31 days in january"
var int1=parseInt(str1)
document.write("str1的數據類型是 :"+typeof str1+"<br>")
document.write("int1的數據類型是 :"+typeof int1+"<br>")
</script>

8.將數字轉換成字符串

<script>
var int1=256
var str1=""+int1
document.write("str1的數據類型是 :"+typeof str1+"<br>")
document.write("int1的數據類型是 :"+typeof int1+"<br>")
</script>

9.聲明數組

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

10.確定數組元素的個數

<script>
array=new Array(5)
array[0]=1
array[1]=3
array[2]=5
array[3]=7
array[4]=11
document.write("數組是:"+array[0]+" "+array[1]+" "+array[2]+" "+array[3]+" "+array[4]+"<br>")
document.write("數組的元素個數是"+array.length)
</script>

11.將數組轉換為字符串

<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.對數組排序

<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 創建表達式

1.使用算術運算符

<script>
var1=12
var2=10
varadd=var1+var2
varsub=var1-var2
varmult=var1*var2
vardiv=var1/var2
varmod=var1%var2
document.write("數據1是:"+var1+"<br>")
document.write("數據2是:"+var2+"<br>")

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