JavsScript补字符PadRight,PadLeft

代码

function padLeft(str, lenght)
{
    if (str.length >= lenght)
        return str;
    else
        return padLeft("0" + str, lenght);
}

function padRight(str, lenght)
{
    if (str.length >= lenght)
        return str;
    else
        return padRight(str + "0", lenght);
}

String扩展

//扩展String方法padLeft（左边补位）
String.prototype.padLeft = function(length,padchar)
{
    var str = this;

    if (str.length >= length)
    {
        return str;
    }
    else
    {
        return (padchar + str).padLeft(length);
    }
}

//扩展String方法padRight（右边变补位）
String.prototype.padRight = function(length,padchar)
{
    var str = this;

    if (str.length >= length)
    {
        return str;
    }
    else
    {
        return (str + padchar).padRight(length);
    }
}