///<summary>
///声明一个相当于C#类StringBuilder
///</summary>
function StringBuilder()
{
    this._string=new Array();
}
///<summary>
///声明一个方法,连接字符串
///</summary>
///<param name=str>要连接的字符串</param>
StringBuilder.prototype.Append=function(str)
{
    this._string.push(str);
}

StringBuilder.prototype.AppendFormat = function() {     
    var result = arguments[0];
    var args = arguments;
    result = result.replace(/\{(\d+)\}/g, function(x, ii){
        return args[parseInt(ii) + 1];
    });    
    this.Append(result);
}

///<summary>
///声明一个方法,获得字符串
///</summary>
StringBuilder.prototype.ToString=function()
{
    return this._string.join("");
}
//获取字符数组 
StringBuilder.prototype.ToCharArray=function() 
{ 
    return this.split(""); 
} 
//获取N个相同的字符串 
StringBuilder.prototype.Repeat=function(num) 
{ 
    var tmpArr=[]; 
    for(var i=0;i<num;i++) tmpArr.push(this); 
    return tmpArr.join(""); 
} 
//逆序 
StringBuilder.prototype.Reverse=function() 
{ 
    return this.split("").reverse().join(""); 
} 
//测试是否是数字 
StringBuilder.prototype.IsNumeric=function() 
{ 
    var tmpFloat=parseFloat(this); 
    if(isNaN(tmpFloat)) return false; 
    var tmpLen=this.length-tmpFloat.toString().length; 
    return tmpFloat+"0".Repeat(tmpLen)==this; 
} 
//测试是否是整数 
StringBuilder.prototype.IsInt=function() 
{ 
    if(this=="NaN") return false; 
    return this==parseInt(this).toStringBuilder(); 
} 
// 合并多个空白为一个空白 
StringBuilder.prototype.resetBlank = function() 
{ 
    return this.replace(/s+/g," "); 
} 
// 除去左边空白 
StringBuilder.prototype.LTrim = function() 
{ 
    return this.replace(/^s+/g,""); 
} 
// 除去右边空白 
StringBuilder.prototype.RTrim = function() 
{ 
    return this.replace(/s+$/g,""); 
} 
// 除去两边空白 
StringBuilder.prototype.trim = function() 
{ 
    return this.replace(/(^s+)|(s+$)/g,""); 
} 
// 保留数字 
StringBuilder.prototype.getNum = function() 
{ 
    return this.replace(/[^d]/g,""); 
} 
// 保留字母 
StringBuilder.prototype.getEn = function() 
{ 
    return this.replace(/[^A-Za-z]/g,""); 
} 
// 保留中文 
StringBuilder.prototype.getCn = function() 
{ 
    return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g,""); 
} 
// 得到字节长度 
StringBuilder.prototype.getRealLength = function() 
{ 
    return this.replace(/[^x00-xff]/g,"--").length; 
} 
// 从左截取指定长度的字串 
StringBuilder.prototype.left = function(n) 
{ 
    return this.slice(0,n); 
} 
// 从右截取指定长度的字串 
StringBuilder.prototype.right = function(n) 
{ 
    return this.slice(this.length-n); 
} 
// HTML编码 
StringBuilder.prototype.HTMLEncode = function() 
{ 
    var re = this; 
    var q1 = [/x26/g,/x3C/g,/x3E/g,/x20/g]; 
    var q2 = ["&","<",">"," "]; 
    for(var i=0;i<q1.length;i++) 
    re = re.replace(q1[i],q2[i]); 
    return re; 
} 
// Unicode转化 
StringBuilder.prototype.ascW = function() 
{ 
    var strText = ""; 
    for (var i=0; i<this.length; i++) strText += "&#" + this.charCodeAt(i) + ";"; 
    return strText; 
}