我是原型继承的新手,所以我试图理解’正确’的方式.我以为我能做到这一点：
if (typeof Object.create !== 'function') {
Object.create = function (o) {
function F() {}
F.prototype = o;
return new F();
};
}
var tbase = {};
tbase.Tdata = function Tdata() {};
tbase.Tdata.prototype.say = function (data) {
console.log(data);
};
var tData = new tbase.Tdata();
tbase.BicData = Object.create(tData);
tbase.BicData.prototype.say = function (data) {
console.log("overridden: " + data)
};
tbase.BicData.prototype.shout = function (data,temp) {
console.log("SHOUT: " + data + "," + temp)
};
var test = new tbase.BicData();
tData.say("test1");
test.say("test2");
test.shout("test3","hope");
if (typeof Object.create !== 'function') {
Object.create = function (o) {
function F() {}
F.prototype = o;
return new F();
};
}
var tbase = {};
tbase.Tdata = function Tdata() {};
tbase.Tdata.prototype.say = function (data) {
console.log(data);
};
var tData = new tbase.Tdata();
tbase.BicData = Object.create(tData);
tbase.BicData.prototype.say = function (data) {
console.log("overridden: " + data)
};
tbase.BicData.prototype.shout = function (data,"hope");
但相反,我得到“tbase.BicData.prototype未定义”
在Java中,我想要的是将Tdata作为样板“接口”,将BicData作为其实现,然后从中实例化对象.
我哪里错了？
解决方法
问题是tbase.BicData是一个对象(tbase.BicData = Object.create(tData);),而prototype属性应该用在构造函数上.
利用Object.create方法,我会做这样的事情：
var tbase = {};
tbase.Tdata = {
say : function (data) {
console.log(data);
}
};
tbase.BicData = Object.create(tbase.Tdata);
tbase.BicData.say = function (data) {
console.log("overridden: " + data)
};
tbase.BicData.shout = function (data," + temp)
};
var test = Object.create(tbase.BicData);
var tData = Object.create(tbase.Tdata);
tData.say("test1"); // test1
test.say("test2"); // overridden: test2
test.shout("test3","hope"); // SHOUT: test3,hope
