替换{0}为指定的字符串(MessageFormat)

package com.text;  
  
import java.text.MessageFormat;  
  
/**替换{0}为指定的字符串*/  
public class MessageFormatTest {  
    public static void main(String[] args) {  
        String message = "hello {0}{1}";  
        message  =  MessageFormat.format(message ,"world","!!!");  
        System.out.println(message);  
    }  
}  

<script type="text/javascript">  
String.prototype.format=function()  
{  
  if(arguments.length==0) return this;  
  for(var s=this, i=0; i<arguments.length; i++)  
    s=s.replace(new RegExp("\{"+i+"\}","g"), arguments[i]);  
  return s;  
};  
  
alert("js实现用自符串替换占位符{0} {1} {2}".format("I", "LOVE", "YOU"));  
</script>