数组排序通用函数

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


var data = [{name: "Zachary", age: 28}, {name: "Nicholas", age: 29}];
data.sort(createComparisonFunction("name"));
alert(data[0].name); //Nicholas
data.sort(createComparisonFunction("age"));
alert(data[0].name); //Zachary