Js日期字符串增多天数的方法

function dateAddDays(dataStr, dayCount) {
    var strdate = dataStr; //日期字符串  
    var isdate = new Date(strdate.replace(/-/g, "/"));  //把日期字符串转换成日期格式  
    isdate = new Date((isdate / 1000 + (86400 * dayCount)) * 1000);  //日期加1天  
    var pdate = isdate.getFullYear() + "-" + (isdate.getMonth() + 1) + "-" + (isdate.getDate());   //把日期格式转换成字符串  

    return pdate;
}