JavaScript design mode 2----policy mode

1, definition: Define a series of algorithms, each package together, and so that they can replace each other

2, Explanation: is the algorithm and a rule of a separate packet, when used alone call.

Simple example:

var strategies = {        "S": function (Salary) {            return salary * 4;        },        "A": function (Salary) {            return SA Lary * 3;        },        "B": function (Salary) {            return salary * 2;        }    }    var Calculatebonus = function (level, salary) {        return strategies[level] (salary);    };    Console.log (Calculatebonus (' S ', 20000))

We can also encapsulate the form validation:

   var strategies = {       Isnonempty:function (value, errormsg) {           if (value = = =) {               return errormsg;           }       },       minlenght:function (value, lenght, errormsg) {           if (Value.length < lenght) {               return errormsg;           }       }   }

　　

JavaScript design mode 2----policy mode