新增allowDays和notAllowDays参数。

应用场景为节假日选择和业务相关，由后台返回。更加灵活

src/laydate.js

@@ -989,6 +989,27 @@
 
     isOut = timestrap.now < timestrap.min || timestrap.now > timestrap.max;
     elem && elem[isOut ? 'addClass' : 'removeClass'](DISABLED);
+
+    //禁止选择日期
+    let notAllowDays = options.notAllowDays;
+    if (notAllowDays != undefined && notAllowDays.length != 0) {
+      var isMatch = notAllowDays.some(function (day) {
+        return new Date(day + ' 00:00:00').getTime() == timestrap.now;
+      })
+      if (isMatch) {
+        isOut = isMatch;
+      }
+    }
+    //允许选择日期
+    let allowDays = options.allowDays;
+    if (allowDays != undefined && allowDays.length != 0) {
+      var isMatch = allowDays.some(function (day) {
+        return new Date(day + ' 00:00:00').getTime() == timestrap.now;
+      })
+      if (isMatch) {
+        isOut = !isMatch;
+      }
+    }
     return isOut;
   };