js中 计算两个日期间的工作日的简单实例

//起始日期，/pattern/是正则表达式的界定符，pattern是要匹配的内容，只用于第一个符号的匹配，g为全局匹配标志var beginDate = new Date("2013-01-01".replace(/-/g, "/"));//结束日期var endDate = new Date("2013-01-31".replace(/-/g, "/"));//日期差值,即包含周六日、以天为单位的工时，86400000=1000*60*60*24.var workDayVal = (endDate - beginDate)/86400000 + 1;//工时的余数var remainder = workDayVal % 7；//工时向下取整的除数var divisor = Math.floor(workDayVal / 7);var weekendDay = 2 * divisor;//起始日期的星期，星期取值有（1,2,3,4,5,6,0）var nextDay = beginDate.getDay();//从起始日期的星期开始 遍历remainder天for(var tempDay = remainder; tempDay>=1; tempDay--) {  //第一天不用加1  if(tempDay == remainder) {    nextDay = nextDay + 0;  } else if(tempDay != remainder) {    nextDay = nextDay + 1;  }  //周日，变更为0  if(nextDay == 7) {    nextDay = 0;  }  //周六日  if(nextDay == 0 || nextDay == 6) {    weekendDay = weekendDay + 1;  }}//实际工时（天） = 起止日期差 - 周六日数目。workDayVal = workDayVal - weekendDay;