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我有三种创建对象的方法：

function createC() {
    function Person(name){
        this.name = name;
        this.getName = function(){  
            return this.name;  
        };
    }
    return new Person("Diego");        
}

function createD() {
    function Person() { };
    Person.prototype.name = "Diego";
    Person.prototype.getName = function () {
        return this.name;
    };
    return new Person();
}

function createE() {
    return Object.create(Object.prototype, {
        name: { value: "Diego" },
        getName: { value: function () { return this.name; } }
    });
}

每个对象中的三个对象可以作为相同的对象使用，但是在检查它们自己的属性时会产生不同的结果。这是我为检查属性而编写的函数：

function checkOwnProperies(obj, name) {
console.log('check object ' + name + '\'s own properties:');
var bIn = false;
for (var v in obj) {
    bIn = true;
    if (obj.hasOwnProperty(v)) {
        console.log('Yes! Found own property: ' + v);
    }
    else {
        console.log('Found a property, but it\'s not own: ' + v);
    }
}
if (!bIn)
    console.log("Didn\'t find any members in " + name + '!');
}

我得到的结果：

oC name: Diego
oD name: Diego
oE name: Diego
check object oC's own properties:
Yes! Found own property: name
Yes! Found own property: getName


check object oD's own properties:
Found a property, but it's not own: name
Found a property, but it's not own: getName


check object oE's own properties:
Didn't find any members in oE!

完整片段：http ://codepen.io/anon/pen/homGx

有人可以解释为什么有区别吗？

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0 回答 0