问题
What is the right way to execute code on Underscore when it gets loaded? I am trying to execute the below code to extend the _ exported namespace automatically when modules require it:
_.mixin(_.str.exports());
The docs are a bit vague but I think I put it in the shim init section? I tried the below but I can't even get a breakpoint to hit in the init:
require.config({
paths: {
jquery: 'libs/jquery/jquery.min',
underscore: 'libs/underscore/lodash.min',
underscorestring: 'libs/underscore/underscore.string.min'
},
shim: {
underscore: {
exports: '_'
}
underscorestring: {
deps: ['underscore'],
init: function (_) {
//Mixin plugin to namespace
_.mixin(_.str.exports());
return _;
}
}
}
});
When I try to do this and use underscorestring, I get this error:
Uncaught TypeError: Object function s(e){return new o(e)} has no method 'startsWith'
Docs:
- http://requirejs.org/docs/api.html#config-shim
- http://requirejs.org/docs/api.html#config-callback
回答1:
I don't know if it's the correct way, but I got it working by inverting things so that underscore depends on underscore.string. Also, this way you don't have to require underscore.string.
require.config({
shim: {
'backbone': {
deps: ['underscore', 'jquery'],
exports: 'Backbone'
},
'underscore': {
deps: ['underscore.string'],
exports: '_',
init: function(UnderscoreString) {
_.mixin(UnderscoreString);
}
}
},
paths: {
'backbone' : 'lib/backbone',
'jquery' : 'lib/jquery/jquery',
'text' : 'lib/require/text',
'underscore' : 'lib/underscore',
'underscore.string' : 'lib/underscore.string'
}
});
.
Update: 3/14/2014
Underscore.js v1.6.0 brought back AMD compatibility and init()
has been removed from RequireJS, so some refactoring is in order. To continue getting Underscore preloaded with Underscore.string I made a mixer module to pull them together.
New Require.js config
requirejs.config({
paths: {
'backbone' : '../lib/backbone/backbone',
'backbone.base' : '../lib/backbone/backbone.base',
'backbone.extensions' : '../lib/backbone/backbone.extensions',
'jquery' : '../lib/jquery/jquery',
'text' : '../lib/require/text',
'underscore' : '../lib/underscore/underscore',
'underscore.mixed' : '../lib/underscore/underscore.mixed',
'underscore.string' : '../lib/underscore/underscore.string'
},
shim: {
'backbone.base': {
deps: ['underscore.mixed', 'jquery'],
exports: 'Backbone'
},
}
});
underscore.mixed
define([
'underscore',
'underscore.string'
], function(_, _s) {
_.mixin(_s.exports());
return _;
});
The final step is to replace all instances of 'underscore'
with 'underscore.mixed'
in module definitions. I attempted moving Underscore into a file named underscore.base.js
and making the regular underscore
the mixer (like the Backbone setup) to avoid this step. Underscore, being a named module, disagreed with the plan.
回答2:
Do you require underscorestring somewhere? Because if it isn't required, it won't be loaded. I managed to get it working with almost exactly the same code you posted:
require.config({
paths: {
underscore: [
'//raw.github.com/documentcloud/underscore/master/underscore-min'
, 'lib/underscore'
]
, underscorestring: 'https://raw.github.com/epeli/underscore.string/master/dist/underscore.string.min'
}
, shim: {
underscore: { exports: '_' },
underscorestring: {
deps: ['underscore'],
init: function(_) {
_.mixin(_.str.exports());
return _; // guess, this is not needed.
}
}
}
, exclude: ['underscore']
});
require(['underscore', 'underscorestring'], function(_) {
console.log( _.chars("i'm a happy string.") );
});
回答3:
Battling with this for hours before i understand what i was doing wrong
This is what i did wrong
You should not rename the file underscore.string in main.js
even though in my library i did rename the file in paths i name it back to 'underscore.string'
This is how your main.js should look like
require.config({
paths: {
underscore: 'lib/underscore',
'underscore.string' : 'lib/_string' ,
},
shim: {
underscore: {
exports: '_',
deps: [ 'jquery', 'jqueryui' ]
},
'underscore.string': {
deps: [ 'underscore' ]
},
}
....
You could then either add it as dependency with in your shim like i did for my mixin file
shim: {
mixin : {
deps: [ 'jquery', 'underscore', 'underscore.string' , 'bootstrap' ]
},
Or just define it in your different pages like
/*global define */
define([
'underscore.string'
], function ( ) {
it just work now you can access it through _.str or _.string
This is why you should do it this way and not try to name it something else
on line 663 of underscore.string.js
// Register as a named module with AMD.
if (typeof define === 'function' && define.amd)
define('underscore.string', [], function(){ return _s; });
Which means that it will only register it with AMD require JS if you are defining 'underscore.string'
For Mix in you could just with define
/*global define */
define([
'underscore',
'underscore.string'
], function ( ) {
_.mixin(_.str.exports());
来源:https://stackoverflow.com/questions/13627376/how-to-mixin-underscore-plugins-in-requirejs