这段代码如何调用？

Question

function create(propertyName) {    return function(object1,object2){         var value1 = object1[propertyName];         var value2 = object2[propertyName];        if(value1 < value2) {            return -1;         } else {            return 0;         }     }; }

Answer 1

var compareAge=create('age');

var a1={

  age:10

};

var a2={

   age:20

};

console.log(compareAge(a1,a2));