angular2 中的 systemjs.config.js [英] systemjs.config.js in angular2
问题描述
我是 angular2 的新手,我想知道 systemjs.config.js 文件中所有对象的使用情况.
I am new to angular2 and I want to know the use of all the objects present inside systemjs.config.js file.
System.config({
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},
// map tells the System loader where to look for things
map: {
// our app is within the app folder
app: 'dist',
main: 'main.js',
// angular bundles
'@angular/core': 'npm:@angular/core/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
'@angular/http': 'npm:@angular/http/bundles/http.umd.js',
'@angular/router': 'npm:@angular/router/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
// other libraries
'rxjs': 'npm:rxjs',
'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
'primeng': 'npm:primeng'
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
app: { main: 'main.js', defaultExtension: 'js' },
api: { defaultExtension: 'js' },
rxjs: {defaultExtension: 'js'},
'node_modules/primeng': {
format: 'cjs',
defaultExtension: 'js'
}
}
});
例如上面粘贴的代码有像paths这样的对象,可以用来指定别名,就像我想知道map的用法和所有地图的内部对象等.
For example the code pasted above has objects like paths which can be used to specify alias, in the same manner I want to know the use of map and all the inner objects of map, so on.
推荐答案
嗯,首先你要知道 npm 包的位置,通常在根目录,因此:
Well, first of all you tell where the npm package is located, usually at the root, hence:
paths: {
// paths serve as alias
'npm:': 'node_modules/'
}
然后你为你将使用的包提供别名(快捷方式名称),在这种情况下,angular 和一些 3rd 方库,如 rxjs,...
then you give aliases ( shortcut names ) to the packages that you will be using, in this case angular and some 3rd party libs like rxjs, ...
map: {
// our app is within the app folder
app: 'dist',
main: 'main.js',
// angular bundles
'@angular/core': 'npm:@angular/core/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
'@angular/http': 'npm:@angular/http/bundles/http.umd.js',
'@angular/router': 'npm:@angular/router/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
// other libraries
'rxjs': 'npm:rxjs',
'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
'primeng': 'npm:primeng'
}
因此,在导入库时无需输入整个路径(例如'npm:@angular/core/bundles/core.umd.js'),而只需导入您给它的别名('@angular/核').导入别名时,您确定导入的是正确的库.
So instead of typing the whole path when you import a library(e.g. 'npm:@angular/core/bundles/core.umd.js'), you will only have to import the alias you gave it ('@angular/core'). When importing the alias, you are sure you're importing the right library.
库的完整路径前面的'npm:',指的是你上面启动的路径'npm'.
the 'npm:' in front of the full paths of the libraries, refers to the path 'npm' you initiated above.
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