尝试简化一些Javascript与闭包 [英] Trying to simplify some Javascript with closures
问题描述
我试图简化一些使用闭包的JS代码,但我无处可能(可能是因为我不是grokking闭包)
我有一些代码看起来像这样:
var server = http.createServer(function(request,response){
var httpmethods = {
GET:function(){
alert('GET')
},
PUT:function(){
alert('PUT')
}
};
});
我试图以这种方式简化:
var server = http.createServer(function(request,response){
var httpmethods = {
GET:function b $ b alertGET()
},
PUT:function(){
alertPUT()
}
};
}
function alertGET(){
alert('GET');
}
function alertPUT(){
alert('PUT');不幸的是,似乎没有工作...
因此:
}
$ b b $ b - 我做错了什么?
- 有可能做到这一点吗?
- 如何?
TIA
- MV
< div类型=h2_lin>解决方案
没有正确设置对象,你把函数名称作为字符串在httpmethods对象中,而不是给它们名称 - 尝试这样: p>
var server = http.createServer(function(request,response){});
var httpmethods = {
get:function(){
alertGET()
},
put:function(){
alertPUT ()
}
};
function alertGET(){
alert('GET called');
}
function alertPUT(){
alert('PUT called');
}
httpmethods.get()
httpmethods.put()
b $ b
这是你在对象中定义方法的方法,但不知道你在那里的其他东西(http.createServer()...?)
I'm trying to simplify some JS code that uses closures but I am getting nowhere (probably because I'm not grokking closures)
I have some code that looks like this:
var server = http.createServer(function (request, response) {
var httpmethods = {
"GET": function() {
alert('GET')
},
"PUT": function() {
alert('PUT')
}
};
});
And I'm trying to simplify it in this way:
var server = http.createServer(function (request, response) {
var httpmethods = {
"GET": function() {
alertGET()
},
"PUT": function() {
alertPUT()
}
};
});
function alertGET() {
alert('GET');
}
function alertPUT() {
alert('PUT');
}
Unfortunately that doesnt seem to work... Thus: - what am I doing wrong? - is it possible to do this? - how?
TIA
-- MV
Not setting up the object properly, you're putting the function names as strings inside the httpmethods object, instead of giving them names - try something like this:
var server = http.createServer( function (request, response) {});
var httpmethods = {
get: function() {
alertGET()
},
put: function() {
alertPUT()
}
};
function alertGET() {
alert('GET called');
}
function alertPUT() {
alert('PUT called');
}
httpmethods.get()
httpmethods.put()
This is the way you define the methods inside the object, but not sure about the other stuff you have there (http.createServer()...?)
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