JavaScript with half the effort (1)

Javascript

This article is Dengyong by the classic forum

Tsinghua University published the "Half a series of JavaScript", I read the book, some translated it. A few years ago looked, recently nothing, turned over, very helpful. This book should have CD-ROM, but the school book, the CD-ROM is not known. I hope it helps you learn 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>")
document.write ("Add data is:" +varadd+ "<br>")
document.write ("Data subtraction is:" +varsub+ "<br>")
document.write ("Data multiplication is:" +varmult+ "<br>")
document.write ("Dividing data is:" +vardiv+ "<br>")
document.write ("Data division remainder is:" +varmod+ "<br>")
</script>

2. Increment variable and decrement variable

<script>
Days=1
document.write ("Output variable" +days+ "<br>")
days++
document.write ("Incremental variable becomes:" +days)
</script>

3. Create a comparison expression

<script>
Daysofmonth=28
if (daysofmonth==28)
Month= "February"
document.write ("Days of Month:" +daysofmonth+ "<br>")
document.write ("Month:" +month)
</script>

4. Creating Logical Expressions

<script>
Dayofmonth=28
if (dayofmonth==28 | | dayofmonth==29)
Month= "February"
document.write ("Days of Month:" +dayofmonth+ "<br>")
document.write ("Month:" +month)
</script>

5. Using the conditional operator

<script language= "JavaScript" >
Stomach= "Hungry";
Time= "5:00";
(stomach== "Hungry" &&time== "5:00")? Eat = "Dinner": eat= "a snack";
document.write ("output result" +eat);
</script>

6. Identifying numbers

<script>
var1=24;
(isNaN (var1))? document.write ("Variable var1" +var1+ "not Number"):D ocument.write ("Variable var1" +var1+ "is number")
</script>

Fourth Chapter control procedure Flow

1. Using the If–else statement

<script>
Month= "December"
Date=25
if (month== "December" && date==25)
document.write ("Today is Christmas, shop closes")
Else
document.write ("Welcome, you come to the store to shop")
</script>

2. Use for loop

<script>
for (count=1;count<=10;count++)
document.write ("Output" +count+ "" + "<br>")
</script>

3. Use while loop

<script>
Count=1
while (count<=15) {
document.write ("Output" +count+ "" + "<br>")
count++}
</script>

4. Interrupt Cycle

<script>
Count=1
while (count<=15) {
count++
if (count==8)
Break
document.write ("Output first" +count+ "sentence" + "<br>")}
</script>

5. Continue the Cycle

<script>
Count=1
while (count<=15) {
count++
if (count==8)
Continue
document.write ("Output first" +count+ "sentence" + "<br>")}
</script>

6. Use JavaScript timer

<script>
function Rabbit ()
{document.write ("output statement")
}
</script>
<body onload=window.settimeout (Rabbit (), 5000) >

7. Set the recurrence interval

<script>
Window.setinterval ("Document.form1.text2.value=document.form1.text1.value", 3000)
</script>
<form name=form1>
<input Type=text name=text1><br>
<input Type=text name=text2><br>
</form>

8. Purge Timeout and interval

<script>
Stop=window.setinterval ("Document.form1.text2.value=document.form1.text1.value", 300)
</script>
<form name=form1>
<input Type=text name=text1><br>
<input Type=text name=text2><br>
<input Type=button name=button1 value= "purge timeout and interval" onclick=clearinterval (stop) >
</form>