Javascript 使用字符串

Javascript 使用字符串

 第九章 使用字符串

1.使用字符串对象

  <  script  >  
mystring  =  "  gdgdfgfddddaaaaaaaaaaaabbbbbbbbbbbbbbbbbvbhg.<br>  "  
document.write(mystring)
document.write(mystring.bold())
document.write(mystring.toUpperCase())
  </  script  >  

2.使用子字符串

  <  script  >  
str1  =  "  fdsf 1111 gfdgfd dfdsf cccc dddd.<br>  "  
document.write(str1)
document.write(str1.substring(  0  ,  13  )  +  "  <br>  "  )
document.write(str1.substr (  20  ,  11  )  +  "  <br>  "  )
  </  script  >  

3.连接字符串

  <  script  >  
str1  =  "  may you find  "  
str2  =  "  peace,happiness and prosperity.<br>  "  
document.write(str1  +  "  <br>  "  )
document.write(str2)
document.write(str1.concat(str2))
document.write(str1  +=  str2)
  </  script  >  

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.setMinutes(  47  )  +  "  <br>  "  );
document.write(  "  设置秒  "  +  cdate.setSeconds(  23  )  +  "  <br>  "  );
document.write(  "  显示设置后的日期和时间  "  +  cdate);
  </  script  > 

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