JavaScript 求两个时间的天数差

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// 求两个时间的天数差 日期格式为 YYYY-MM-dd   function daysBetween(DateOne,DateTwo){       var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));      var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);      var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));      var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));      var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);      var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));      var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);       return Math.abs(cha);  }