javascript当中string对象用法
string对象
马克- to-win:马克 java社区:防盗版实名手机尾号: 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("马克-to-win第1个字符为:"+hello.charAt(0)+"<BR>")
write("L在第"+hello.indexOf("L")+"个字符"+"<BR>")
write("L在第"+hello.lastIndexOf("L")+ "个字符"+"<BR>")
write("k在第"+hello.indexOf("k")+"个字符"+"<BR>")
/*String.fontsize() (Method)
Encapsulates the string within an <FONT SIZE="..."> tag context.*/
write(hello.fontsize("5")+"<BR>")
/*和Array的slice 一样, fomer包括,latter不包括*/
write("截取第2至第4个字符:"+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("截取从第2个字符开始的3个字符:"+hello.substr(1,4)+"<BR>")
write("转换为大写:"+hello.toUpperCase()+"<BR>")
write("转换为小写:"+hello.toLowerCase()+"<BR>")
}
</Script>
</BODY>
</HTML>
输出结果:
HELLO mark!
马克-to-win第1个字符为:H
L在第2个字符
L在第3个字符
k在第9个字符
HELLO mark!
截取第2至第4个字符:ELL
截取从第2个字符开始的3个字符:ELLO
转换为大写:HELLO MARK!
转换为小写: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>"); //将会出现错误,因为数值型不支持bold()方法
/* 马克-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