本文介绍了如何使用ClojureScript中的方法和构造函数创建JS对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
假设任务是在clojurescript中创建一些实用程序库,以便可以从JS中使用。例如,我想生成一个等价的:
var Foo = function(a,b,c){
this.a = a;
this.b = b;
this.c = c;
}
Foo.prototype.bar = function(x){
return this.a + this.b + this.c + x;
}
var x = new Foo(1,2,3);
x.bar(3); //>> 9
一个实现它的方法是:
(deftype Foo [abc])
(set!(.bar(.prototype Foo))
(fn [x]
(this-as this
(+(.a this)(.b this)(.c this)x))))
(def x 2 3))
(.bar x 3); >> 9
问题:clojurescript中有更优雅/惯用的方式吗? strong>
解决方案
这是通过添加一个魔法对象协议到deftype:
deftype Foo [abc]
对象
(bar [this x](+ abcx)))
(def afoo(Foo。1 2 3))
); >> 9
Imagine the task is to create some utility lib in clojurescript so it can be used from JS.
For example, let's say I want to produce an equivalent of:
var Foo = function(a, b, c){
this.a = a;
this.b = b;
this.c = c;
}
Foo.prototype.bar = function(x){
return this.a + this.b + this.c + x;
}
var x = new Foo(1,2,3);
x.bar(3); // >> 9
One way to achieve it I came with is:
(deftype Foo [a b c])
(set! (.bar (.prototype Foo))
(fn [x]
(this-as this
(+ (.a this) (.b this) (.c this) x))))
(def x (Foo. 1 2 3))
(.bar x 3) ; >> 9
Question: is there more elegant/idiomatic way of the above in clojurescript?
解决方案
This was solved with JIRA CLJS-83 by adding a magic "Object" protocol to the deftype:
(deftype Foo [a b c]
Object
(bar [this x] (+ a b c x)))
(def afoo (Foo. 1 2 3))
(.bar afoo 3) ; >> 9
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