javascript當(dāng)中string對(duì)象用法

string對(duì)象
馬克- to-win：馬克 java社區(qū)：防盜版實(shí)名手機(jī)尾號(hào)： 73203。
例 3.1

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
</HEAD>

<BODY>
<Script>
   var hello = "HELLO mark!"
   with(document) {
      write(hello,"<BR>")
      write("馬克-to-win第1個(gè)字符為："+hello.charAt(0)+"<BR>")
      write("L在第"+hello.indexOf("L")+"個(gè)字符"+"<BR>")
      write("L在第"+hello.lastIndexOf("L")+ "個(gè)字符"+"<BR>")
      write("k在第"+hello.indexOf("k")+"個(gè)字符"+"<BR>")
/*String.fontsize() (Method)
Encapsulates the string within an <FONT SIZE="..."> tag context.*/
      write(hello.fontsize("5")+"<BR>")
/*和Array的slice 一樣， fomer包括，latter不包括*/     
      write("截取第2至第4個(gè)字符:"+hello.substring(1,4)+"<BR>")
/* myString.substr(aStartPosition, aLength)
Argument list: aStartPosition The index of the first character in the substring
aLength The length of the substring
*/
      write("截取從第2個(gè)字符開始的3個(gè)字符:"+hello.substr(1,4)+"<BR>")
      write("轉(zhuǎn)換為大寫："+hello.toUpperCase()+"<BR>")
      write("轉(zhuǎn)換為小寫："+hello.toLowerCase()+"<BR>")
   }

</Script>

</BODY>
</HTML>


輸出結(jié)果：

HELLO mark!
馬克-to-win第1個(gè)字符為：H
L在第2個(gè)字符
L在第3個(gè)字符
k在第9個(gè)字符
HELLO mark!
截取第2至第4個(gè)字符:ELL
截取從第2個(gè)字符開始的3個(gè)字符:ELLO
轉(zhuǎn)換為大寫：HELLO MARK!
轉(zhuǎn)換為小寫：hello mark!




例 3.2


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
</head> 
<Script>
   var str   = "Hello!";
   var num   = 1245;
   with(document){
/*String.bold() (Method)
Encapsulates the string within an <B> tag context.*/
      write(str.bold()+"<BR>");
    //  write(num.bold()+"<BR>");    //將會(huì)出現(xiàn)錯(cuò)誤，因?yàn)閿?shù)值型不支持bold()方法
/* 馬克-to-win Number.toString() (Method)
Return a string primitive version of an object.
Property/method value type: String primitive
JavaScript syntax: - myNumber.toString(aRadix)
*/
      var abc="";
      abc= num.toString();  
       write(abc.bold()+"<BR>");

   }
</Script>
</HEAD>
<BODY>
</BODY>
</HTML>


Hello!
1245