More than a series of javascript

The first chapter of JavaScript introduction

1. Enter a JavaScript statement in the address bar

Javascript:Document.write ("Show text")

2. Embed JavaScript in an HTML document

<script language=javascript>
Document.bgcolor= "Blue."
</script>

Chapter II using Variables and arrays

1. Declaring variables

<script language=javascripe>
Var Answer1,answer2,answer3,answer4;
answer1=9;
answer2=2.5
answer3= "Milkey May"
Answer4=true
</script>

2. Using integer

<script language=javascript>
var decimalnum,hexadecimalnum,octalnum
Decimalnum=24
hexadecimalnum=0x24
octalnum=024
document.write ("Display decimal number:" + decimalnum+ "<br>")
document.write ("Display hexadecimal number:" + hexadecimalnum + "<br>")
document.write ("Show octal number:" + octalnum + "<br>")
</script>

3. Using floating point numbers

<script language=javascript>
var num1,num2,num3,num4
num1=1234567890000.0
Num2=5.14e23
num3=0.0000123456
Num4=6.0254e3-4
document.write ("Floating-point number 1:" +num1+ "<br>")
document.write ("Floating-point number 2:" +num2+ "<br>")
document.write ("Floating-point number 3:" +num3+ "<br>")
document.write ("Floating-point number 4:" +num4+ "<br>")
</script>

4. Using Boolean values

<script language=javascript>
var answer1,answer2
Answer1=true
Answer2=false
document.write ("Display Boolean 1:" +answer1+ "<br>")
document.write ("Display Boolean 2:" +answer2+ "<br>")
</script>

5. Using a String

<script language=javascript>
var str1,str2
str1= "FDSGDG DSFDSF"
Str2= "Wuhan Rtvu"
document.write ("Display string 1:" +str1+ "<br>")
document.write ("Display string 2:" +str2+ "<br>")
</script>

6. Determine variable type

<script>
var answer1,answer2,answer3,answer4
Answer1=9
answer2=2.5
Answer3= "Milky May"
Answer4=true
document.write ("The type of variable 1 is:" +typeof answer1 + "<br>")
document.write ("The type of variable 2 is:" +typeof answer2 + "<br>")
document.write ("The type of variable 3 is:" +typeof Answer3 + "<br>")
document.write ("The type of variable 4 is:" +typeof answer4 + "<br>")
</script>

7. Convert a string into a number

<script>
var str1= "in January"
var int1=parseint (STR1)
document.write ("str1 data type is:" +typeof str1+ "<br>")
document.write ("Int1 data type is:" +typeof int1+ "<br>")
</script>

8. Convert numbers to Strings

<script>
var int1=256
var str1= "" +int1
document.write ("str1 data type is:" +typeof str1+ "<br>")
document.write ("Int1 data type is:" +typeof int1+ "<br>")
</script>

9. Declaring an array

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

10. Determine the number of array elements

<script>
Array=new Array (5)
Array[0]=1
Array[1]=3
Array[2]=5
Array[3]=7
array[4]=11
document.write ("Array is:" +array[0]+ "" +array[1]+ "" +array[2]+ "" +array[3]+ "" +array[4]+ "<br>")
document.write ("The number of elements of an array is" +array.length)
</script>

11. Convert an array to a string

<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. Sorting arrays

<script>
Array=new Array ()
array[0]= "Dark"
array[1]= "Apple"
array[2]= "Nebula"
array[3]= "Water"
Str1=array.sort ()
document.write (str1+ "<br>")
</script>

Chapter Three Creating an expression

1. Using Arithmetic operators

<script>
Var1=12
var2=10
Varadd=var1+var2
Varsub=var1-var2
Varmult=var1*var2
Vardiv=var1/var2
Varmod=var1%var2
document.write ("Data 1 is:" +var1+ "<br>")
document.write ("Data 2 is:" +var2+ "<br>")