【记】琐碎

1. json转化
 简单通常使用eval("("+s+")");来转化为json通常用安全问题，今看到baidu tangram.js 使用：

 

function (data) {

    return (new Function("return " + data))();

};

so资料 http://snandy.javaeye.com/blog/615216 

http://snandy.javaeye.com/blog/678587 

 

2.子窗口描点问题:

在iframe中有描点链接 如果在父窗口中有滚动条或者没有滚动条而实际使用了overflow：hidden使其隐藏，再点击描点的时候会造成top窗口的滑动;

3.计算某个时间距离当前时间的长度:

 Date对象有个parse方法，并返回 1970/1/1 午夜距离该日期时间的毫秒数;Date有许多方法使用的时候往往忘记；平时多加记忆

http://blog.csdn.net/xxd851116/archive/2009/05/26/4218858.aspx

http://www.w3school.com.cn/js/jsref_parse.asp;

http://www.w3school.com.cn/js/jsref_obj_date.asp

http://www.cnblogs.com/east-liujie/archive/2006/10/21/535784.html

其函数为:

function getDateDiff(d){   
    var now = new Date().getTime();
    var diffValue = now - Date.parse(d);
    if(diffValue < 0){     
        return ;    
    }   
    var minute = 1000 * 60;  
    var hour = minute * 60;  
    var day = hour * 24; 
    var month = day * 30; 
    var monthC =diffValue/month;   
    var weekC =diffValue/(7*day);   
    var dayC =diffValue/day;   
    var hourC =diffValue/hour;  
    var minC =diffValue/minute;       
    if(monthC>=1){    
        result=parseInt(monthC) + "个月前";    
    }else if(weekC>=1){
        result=parseInt(weekC) + "个星期前";    
    }else if(dayC>=1){    
        result= parseInt(dayC) +"天前";    
    }else if(hourC>=1){    
        result= parseInt(hourC) +"个小时前";   
    }else if(minC>=1){    
        result= parseInt(minC) +"分钟前";    
    }else{
        result="";    
    } 
    return result;  
};

 

加减日期:

/*
 * 根据传入日期，要处理的天数，进行加/减计算。
 * 日期格式：XXXX年XX月XX日
 */
function addByTransDate(dateParameter, num) {

    var translateDate = "", dateString = "", monthString = "", dayString = "";
    translateDate = dateParameter.replace("-", "/").replace("-", "/");;

    var newDate = new Date(translateDate);
    newDate = newDate.valueOf();
    newDate = newDate + num * 24 * 60 * 60 * 1000;
    newDate = new Date(newDate);

    //如果月份长度少于2，则前加 0 补位
    if ((newDate.getMonth() + 1).toString().length == 1) {

        monthString = 0 + "" + (newDate.getMonth() + 1).toString();
        alert(translateDate);
    } else {

        monthString = (newDate.getMonth() + 1).toString();
        alert(translateDate);
    }

    //如果天数长度少于2，则前加 0 补位
    if (newDate.getDate().toString().length == 1) {

        dayString = 0 + "" + newDate.getDate().toString();
    } else {

        dayString = newDate.getDate().toString();
    }

    dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString;
    return dateString;
}

function reduceByTransDate(dateParameter, num) {

    var translateDate = "", dateString = "", monthString = "", dayString = "";
    translateDate = dateParameter.replace("-", "/").replace("-", "/");;

    var newDate = new Date(translateDate);
    newDate = newDate.valueOf();
    newDate = newDate - num * 24 * 60 * 60 * 1000;
    newDate = new Date(newDate);

    //如果月份长度少于2，则前加 0 补位
    if ((newDate.getMonth() + 1).toString().length == 1) {

        monthString = 0 + "" + (newDate.getMonth() + 1).toString();
        alert(translateDate);
    } else {

        monthString = (newDate.getMonth() + 1).toString();
        alert(translateDate);
    }

    //如果天数长度少于2，则前加 0 补位
    if (newDate.getDate().toString().length == 1) {

        dayString = 0 + "" + newDate.getDate().toString();
    } else {

        dayString = newDate.getDate().toString();
    }

    dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString;
    return dateString;
}