= JavaScript =
 * 双字节字符串处理
  {{{#!java

String.prototype.leftB=function(len){
　　var s=this.replace(/\*/g," ").replace(/[^\x00-\xff]/g,"**")
　　return this.slice(0,s.slice(0,len).replace(/\*\*/g," ").replace(/\*/g,"").length)
}
String.prototype.lenB=function(){
　　return this.replace(/\*/g," ").replace(/[^\x00-\xff]/g,"**").length
}
str="hi,我是中国人"
alert("原始字符串："+str+"\n字符串长度："+str.length+"\n双字节长度："+str.lenB()+"\n前10位字节："+str.leftB(10))

  }}}