1. JavaScript

• 双字节字符串处理

  •    1 
       2 String.prototype.leftB=function(len){
       3 　　var s=this.replace(/\*/g," ").replace(/[^\x00-\xff]/g,"**")
       4 　　return this.slice(0,s.slice(0,len).replace(/\*\*/g," ").replace(/\*/g,"").length)
       5 }
       6 String.prototype.lenB=function(){
       7 　　return this.replace(/\*/g," ").replace(/[^\x00-\xff]/g,"**").length
       8 }
       9 str="hi,我是中国人"
      10 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))
      11 
      12