js把星期由数字转换为星期名称

//由星期的数字转换为星期的名称,date格式：2016-01-07，用"-"分割
function toWeekName(date) {
    var newDate = new Date(date.replace(/-/g, '/'));
    var weekday = new Array(7);
    weekday[0] = "星期日";
    weekday[1] = "星期一";
    weekday[2] = "星期二";
    weekday[3] = "星期三";
    weekday[4] = "星期四";
    weekday[5] = "星期五";
    weekday[6] = "星期六";
    return weekday[newDate.getDay()];
}