Javascript 学习笔记之String类测试

/* -------------------------
  String类 测试
----------------------------*/
function writeline(message)
{
    document.write(message);
    document.write("<br>");
}

var str1 = "hello world";
var str2 = new String("hello world");
writeline(str1 == str2) //true;
writeline(str1.length);//11 length返回字符串中字符的个数

writeline(str1.charAt(1)); //e
writeline(str1.charCodeAt(1)); //101 e的编码

writeline(str1.concat(" hi"));//hello world hi
writeline(str1 + " hi"); //hello world hi

writeline(str1.indexOf("h")); //0
writeline(str1.lastIndexOf("l")); //9

writeline(str1.localeCompare("a")); //1
writeline(str1.localeCompare(str2));//0
writeline(str1.localeCompare("z"));//-1

writeline(str1.slice(3)); //lo world
writeline(str1.substring(3)); //lo world
writeline(str1.slice(3,7)); //lo w
writeline(str1.substring(3,7)); //lo w

writeline(str1.slice(-3));//rld 取最后三个字符 
writeline(str1.substring(-3)); //hello world 忽略负数， 
writeline(str1.slice(3,-4));//lo w slice(3,7)
writeline(str1.slice(3,-4));//lo w substring(0,3)

writeline(str1.toUpperCase())
writeline(str1.toLocaleUpperCase());
writeline(str1.toLowerCase());
writeline(str1.toLocaleLowerCase());

<待续>