4.格式化字符串变量  
<script>  
str1="peace,happiness and prosperity.<br>"  
document.write(str1)  
document.write(str1.big())  
document.write(str1.small())  
document.write(str1.bold())  
document.write(str1.italics())  
document.write(str1.strike())  
document.write(str1.fontsize(6))  
document.write(str1.fontcolor(green))  
</script>  
5.创建锚和链接  
<script>  
str1="this is the bigginning of the page.<br>"  
str2="….<br>"  
str3="this is the end of the page .<br>"  
str4="link to the start<br>"  
str5="link to the end<br>"  
document.write(str1.anchor("start"))  
for(i=0;i<10;i++)  
document.write(str2);  
document.write(str3.anchor("end"))  
document.write(str4.link("#start"))  
document.write(str5.link("#end"))  
</script>  
6.确定字符串长度  
<script>  
str1="this is the bigginning of the page."  
document.write(str1+"<br>")  
document.write( "字符串的长度是:"+str1.length)  
document.write("字符串全部大写是;"+str1.toUpperCase())  
document.write("字符串全部小写是;"+str1.toLowerCase())  
</script>  
7.在字符串内搜索 
<script>  
str1="this is the end of the line.<br>"  
document.write(str1)  
document.write("字符end在字符串的位置是"+str1.search("end"))  
document.write("字符dog在字符串的位置是"+str1.search("dog"))  
</script>  
8.定位字符串中的字符  
<script>  
str1="spring is a time for flowers and trees and baby bunnles<br>"  
document.write(str1)  
document.write("the index for the second word ‘and' is"+str1.indexOf("and",30))  
documednt.write("the last index of the word ‘and' is "+str1.lastIndexOf("and"))  
</script>  
9.替换字符串中的文本  
<script>  
str1="spring is a time for flowers and trees and baby bunnles<br>"  
document.write(str1)  
document .write(str1.replace("and",","))  
</script>  
10.字符串分离  
<script>  
str1="spring is a time for flowers and trees and baby bunnles<br>"  
document.write(str1)  
str1array=str1.split(" ")  
document.write(str1array[0]+"<br>")  
document.write(str1array[1]+"<br>")  
document.write(str1array[2]+"<br>")  
document.write(str1array[3]+"<br>")  
</script>  
第十章 使用日期和时间  
1.使用Date对象  
<script>  
cdate=new Date("august 2,1989 12:30:00")  
document.write(cdate)  
</script>  
2.显示当地时间和日期  
<script>  
cdate=new Date()  
document.write("当前时间是:"+cdate.toGMTString()+"<br>")  
document.write("日期和时间是:"+cdate.toLocaleString())  
</script>  
3.获得时间和日期值  
<script>  
cdate=new Date()  
document.write("显示当前的星期"+cdate.getDay()+"<br>")  
document.write("显示当前的月份"+cdate.getMonth()+"<br>")  
document.write("显示当前的日期"+cdate.getDay()+"<br>")  
document.write("显示当前的年份"+cdate.getYear()+"<br>")  
document.write("显示当前的小时"+cdate.getHours()+"<br>")  
document.write("显示当前的分钟"+cdate.getMinutes()+"<br>")  
document.write("显示当前的秒"+cdate.getSeconds()+"<br>")  
</script>  
4.设置时间和日期值  
<script language=javascript>  
cdate=new Date("December 25,1984")  
document.write("显示日期"+cdate+"<br>")  
document.write("设置月份"+cdate.setMonth(10)+"<br>")  
document.write("设置日期"+cdate.setDate(23)+"<br>")  
document.write("设置年份"+cdate.setYear(2000)+"<br>")  
document.write("设置小时"+cdate.setHours(13)+"<br>");  
document.write("设置分钟"+cdate.