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"
array[2]="nebula"
array[3]="water"
str1=array.join()
str2=array.join(" ")
document.write(str1+"<br>")
document.write(str2)
</script>
12.对数组排序
<script>
array=new Array()
array[0]="dark"
array[1]="apple"
array[2]="nebula"
array[3]="water"
str1=array.sort()
document.write(str1+"<br>")
</script>
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