javascript當中string對象用法
string對象
馬克- to-win:馬克 java社區(qū):防盜版實名手機尾號: 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個字符為:"+hello.charAt(0)+"<BR>")
write("L在第"+hello.indexOf("L")+"個字符"+"<BR>")
write("L在第"+hello.lastIndexOf("L")+ "個字符"+"<BR>")
write("k在第"+hello.indexOf("k")+"個字符"+"<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個字符開始的3個字符:"+hello.substr(1,4)+"<BR>")
write("轉換為大寫:"+hello.toUpperCase()+"<BR>")
write("轉換為小寫:"+hello.toLowerCase()+"<BR>")
}
</Script>
</BODY>
</HTML>
輸出結果:
HELLO mark!
馬克-to-win第1個字符為:H
L在第2個字符
L在第3個字符
k在第9個字符
HELLO mark!
截取第2至第4個字符:ELL
截取從第2個字符開始的3個字符:ELLO
轉換為大寫:HELLO MARK!
轉換為小寫: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>"); //將會出現(xiàn)錯誤,因為數(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