//判断中英混合字符长度

String.prototype.gblen = function() {  
    var len = 0;  
    for (var i=0; i<this.length; i++) {  
        if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) {  
            len += 2;  
        } else {  
            len ++;  
        }  
    }  
    return len;  
}
  
String.prototype.gbtrim = function(len, s) {  
    var str = '';  
    var sp  = s || '';  
    var len2 = 0;  
    for (var i=0; i<this.length; i++) {  
        if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) {  
            len2 += 2;  
        } else {  
            len2 ++;  
        }  
    }  
    if (len2 <= len) {  
        return this;  
    }  
    len2 = 0;  
    len  = (len > sp.length) ? len-sp.length: len;  
    for (var i=0; i<this.length; i++) {  
        if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) {  
            len2 += 2;  
        } else {  
            len2 ++;  
        }  
        if (len2 > len) {  
            str += sp;  
            break;  
        }  
        str += this.charAt(i);  
    }  
    return str;  
}

String.prototype.getLength = function(){ 
  var len2 = 0;  
  for(var i=0;i<this.length;i++){    
    if(this.charCodeAt(i)>127 || this.charCodeAt(i)==94){
      len2+=2;
    }else{
      len2++;
    }    
  }
  return len2;
}