一、建構函式內定義的屬性/方法
function
fn(name)
;var a =
newfn
('張三');
var b =
newfn
('李四');
console.
log(a.name)
//張三
console.
log(b.name)
//李四
二、被繼承的原型物件中屬性/方法
function
fn(name)
;fn.prototype.age=
'13'
var a =
newfn
('張三');
var b =
newfn
('李四');
console.
log(a.name)
//張三
console.
log(b.name)
//李四
console.
log(a.age)
//13
console.
log(b.age)
//13
誤導
function
fn(name)
;fn.prototype.age=
'13'
var a =
newfn
('張三');
var b =
newfn
('李四');
fn.prototype=
console.
log(a.name)
//張三
console.
log(b.name)
//李四
console.
log(a.age)
//13
console.
log(b.age)
//13
console.
log(a.url)
//undefined
console.
log(b.url)
//undefined
console.
log(a.name)
//張三
console.
log(b.name)
//李四
console.
log(a.age)
//undefined
console.
log(b.age)
//undefined
console.
log(a.url)
console.
log(b.url)
此時：a 和 b 的 _proto_指向的是之前的原型物件；現在的原型物件實質就是將prototype指向乙個新的物件；和之前的原型物件沒有關係！
如果寫成這樣，那就是你想的那樣子了！
function
fn(name)
;fn.prototype.age=
'13'
fn.prototype=
var a =
newfn
('張三');
var b =
newfn
('李四');
console.
log(a.name)
//張三
console.
log(b.name)
//李四
console.
log(a.age)
//undefined
console.
log(b.age)
//undefined
console.
log(a.url)
console.
log(b.url)
請看**↓
function
fn(name)
;fn.prototype.age=
'13'
var a =
newfn
('張三');
var b =
newfn
('李四');
fn.prototype=
//例項通過__proto__把指標指向新置換的原型物件
a.__proto__=fn.prototype;
b.__proto__=fn.prototype;
console.
log(a.name)
//張三
console.
log(b.name)
//李四
console.
log(a.age)
//undefined
console.
log(b.age)
//undefined
console.
log(a.url)
console.
log(b.url)
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