Javascript获取星座名称与生肖的代码

//取生肖, 参数必须是四位的年
function getshengxiao(yyyy){
      var arr=['猴','鸡','狗','猪','鼠','牛','虎','兔','龙','蛇','马','羊'];
      return /^＼d{4}$/.test(yyyy)?arr[yyyy%12]:null
}
 
// 根据生日的月份和日期，计算星座。
function getAstro(month,day){
      var s="魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯";
      var arr=[20,19,21,21,21,22,23,23,23,23,22,22];
      return s.substr(month*2-(day }

function toStar( date ) {
        ss = date.split( "-" );
        month= parseInt( ss[1], 10 );
        date = parseInt( ss[2], 10 );
      
        if (month == 1 && date >=20 || month == 2 && date <=18) {
            value = "水瓶座";
        } else if (month == 2 && date >=19 || month == 3 && date <=20) {
            value = "双鱼座";
        } else if (month == 3 && date >=21 || month == 4 && date <=19) {
            value = "白羊座";
        } else if (month == 4 && date >=20 || month == 5 && date <=20) {
            value = "金牛座";
        } else if (month == 5 && date >=21 || month == 6 && date <=21) {
            value = "双子座";
        } else if (month == 6 && date >=22 || month == 7 && date <=22) {
            value = "巨蟹座";
        } else if (month == 7 && date >=23 || month == 8 && date <=22) {
            value = "狮子座";
        } else if (month == 8 && date >=23 || month == 9 && date <=22) {
            value = "室女座";
        } else if (month == 9 && date >=23 || month == 10 && date <=22) {
            value = "天秤座";
        } else if (month == 10 && date >=23 || month == 11 && date <=21) {
            value = "天蝎座";
        } else if (month == 11 && date >=22 || month == 12 && date <=21) {
            value = "人马座";
        } else if (month == 12 && date >=22 || month == 1 && date <=19) {
            value = "摩羯座";
        }
        return value;
    }
alert(toStar('1986-12-05'));