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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(shù)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(shù)

<script language=javascript>

var decimalNum,hexadecimalNum,octalNum

decimalNum=24

hexadecimalNum=0x24

octalNum=024

document.write("顯示十進制數(shù)："+ decimalNum+"<br>")

document.write("顯示十六進制數(shù)："+ hexadecimalNum +"<br>")

document.write("顯示八進制數(shù)："+ octalNum +"<br>")

</script>

3.使用浮點數(shù)

<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(shù)1："+num1+"<br>")

document.write("浮點數(shù)2："+num2+"<br>")

document.write("浮點數(shù)3："+num3+"<br>")

document.write("浮點數(shù)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(xué)"

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(zhuǎn)換成數(shù)字

<script>

var str1="31 days in january"

var int1=parseInt(str1)

document.write("str1的數(shù)據(jù)類型是 ："+typeof str1+"<br>")

document.write("int1的數(shù)據(jù)類型是 ："+typeof int1+"<br>")

</script>

8.將數(shù)字轉(zhuǎn)換成字符串

<script>

var int1=256

var str1=""+int1

document.write("str1的數(shù)據(jù)類型是 ："+typeof str1+"<br>")

document.write("int1的數(shù)據(jù)類型是 ："+typeof int1+"<br>")

</script>

9.聲明數(shù)組

<script>

array=new Array(5)

array[0]=1

array[1]=3

array[2]=5

array[3]=7

array[4]=11

document.write("數(shù)組是："+array[0]+" "+array[1]+" "+array[2]+" "+array[3]+" "+array[4])

</script>

10.確定數(shù)組元素的個數(shù)

<script>

array=new Array(5)

array[0]=1

array[1]=3

array[2]=5

array[3]=7

array[4]=11

document.write("數(shù)組是："+array[0]+" "+array[1]+" "+array[2]+" "+array[3]+" "+array[4]+"<br>")

document.write("數(shù)組的元素個數(shù)是"+array.length)

</script>

11.將數(shù)組轉(zhuǎn)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(shù)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(chuàng)建表達(dá)式

1.使用算術(shù)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(shù)據(jù)1是："+var1+"<br>")

document.write("數(shù)據(jù)2是："+var2+"<br>")

更多信息請查看IT技術(shù)專欄