对象添加只读属性

如果希望对象中的属性不可更改，可以利用Object.defineProperty 来做。 demo如下：

 

function Person() {

}

var feature = {
    "age" : 10,
    "sex" : "man"
};


var featureConf = {};
featureConf.get = function () {
    return feature;
};
featureConf.set = function () {
    console.log("can not set feature, but can set feature field");
};

Object.defineProperty(Person, "feature", featureConf);

console.log("age is: " + Person.feature.age);

Person.feature = {};

// Person.feature.age = 20;
// console.log("age after is: " + Person.feature.age);

 

打印如下： age is: 10
                  can not set feature, but can set feature field

 

从打印我们看出Person.feature = {};  是不行的。 

但我们可以修改feature里面的属性。