Javascript Node.js“需要”函数和参数
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Node.js "require" function and parameters
提问by user885355
When I do:
当我做：
lib = require('lib.js')(app)
is appactually geting passed in?
在app实际歌厅通过呢？
in lib.js:
在 lib.js 中：
exports = module.exports = function(app){}
Seems like no, since when I try to do more than just (app)and instead do:
似乎没有，因为当我尝试做的不仅仅是做更多的(app)事情时：
lib = require('lib.js')(app, param2)
And:
和：
exports = module.exports = function(app, param2){}
I don't get params2.
我不明白params2。
I've tried to debug by doing:
我尝试通过以下方式进行调试：
params = {}
params.app = app
params.param2 = "test"
lib = require("lib.js")(params)
but in lib.js when I try to JSON.stringifyI get this error:
但是在 lib.js 中，当我尝试时出现JSON.stringify此错误：
"DEBUG: TypeError: Converting circular structure to JSON"
回答by Raynos
When you call lib = require("lib.js")(params)
你打电话时 lib = require("lib.js")(params)
You're actually calling lib.jswith one parameter containing two properties name appand param2
您实际上是lib.js使用一个包含两个属性名称app和param2
You either want
你要么想要
// somefile
require("lib.js")(params);
// lib.js
module.exports = function(options) {
var app = options.app;
var param2 = options.param2;
};
or
或者
// somefile
require("lib.js")(app, param2)
// lib.js
module.exports = function(app, param2) { }
回答by Jim Schubert
You may have an undefined value that you're trying to pass in.
您可能有一个试图传入的未定义值。
Take for instance, requires.js:
举个例子，requires.js：
module.exports = exports = function() {
console.log('arguments: %j\n', arguments);
};
When you call it correctly, it works:
当您正确调用它时，它可以工作：
node
> var requires = require('./requires')(0,1,2,3,4,5);
arguments: {"0":0,"1":1,"2":2,"3":3,"4":4,"5":5}
If you have a syntax error, it fails:
如果您有语法错误，则会失败：
> var requires = require('./requires')(0,);
... var requires = require('./requires')(0,2);
...
If you have an undefined object, it doesn't work:
如果你有一个未定义的对象，它不起作用：
> var requires = require('./requires')(0, undefined);
arguments: {"0":0}
So, I'd first check to see that your object is defined properly (and spelled properly when you pass it in), then check that you don't have syntax errors.
因此，我会首先检查您的对象是否正确定义（并在您传入时正确拼写），然后检查您是否没有语法错误。
