梅花雪日历限制只可以小于等于当前日期的功能

...
    this.DarkBorder = "#D4D0C8";    //日期显示的立体表达色
    this.isLessToday  = false;
...
    var o = WebCalendar.calendar.style; WebCalendar.eventSrc = e;
    if (arguments.length == 0) WebCalendar.objExport = e;
    if (arguments.length == 1 && typeof(arguments[0])=="boolean") {WebCalendar.objExport = e;WebCalendar.isLessToday=arguments[0];}
    else WebCalendar.objExport = eval(arguments[0]);
    if (arguments.length == 2){WebCalendar.objExport = eval(arguments[0]);WebCalendar.isLessToday=arguments[1];}
...
        var returnValue;
        var aa = (arguments.length==0) ? WebCalendar.day[this.id.substr(8)] : arguments[0];
        var a = (arguments.length==0) ? WebCalendar.day[this.id.substr(8)].split("/") : arguments[0].split("/");
        var d = WebCalendar.format.match(/^(\w{4})(-|\/|.|)(\w{1,2})\2(\w{1,2})$/);
        if(d==null){alert("你设定的日期输出格式不对！\r\n\r\n请重新定义WebCalendar.format ！"); return false;}
        var flag = d[3].length==2 || d[4].length==2; //判断返回的日期格式是否要补零
        returnValue = flag ? a[2] +d[2]+ appendZero(a[1]) +d[2]+ appendZero(a[0]) : a[2] +d[2]+ a[1] +d[2]+ a[0];
        if(WebCalendar.timeShow)
        {
            var h = new Date().getHours(), m = new Date().getMinutes(), s = new Date().getSeconds();
            returnValue += flag ? " "+ appendZero(h) +":"+ appendZero(m) +":"+ appendZero(s) : " "+  h  +":"+ m +":"+ s;
        }
        if(WebCalendar.isLessToday && Date.parse(aa)<=Date.parse(WebCalendar.today))
        {
            WebCalendar.objExport.value = returnValue;
            hiddenCalendar();
        }

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