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>
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