我有一个角2.0.0 (在2.2.0中同样的问题)项目。当前的dev构建会生成>100个http请求。
这是因为它加载了非捆绑版本的rxjs。
当我有以下情况时:
map: {
// our app is within the app folder
app: 'app',
// angular bundles
// snip
'rxjs': 'npm:rxjs',
'angular-in-memory-web-api': 'npm:angular-in-memory-web-api',
},这个应用程序可以工作,但是我们有1000+ http请求程序,所以我尝试从包中加载rxjs,为了做到这一点,我删除了rxjs': 'npm:rxjs',并添加了以下内容
注意,对于这两个npm:从unpkg加载
paths: {
// paths serve as alias
'npm:': 'https://unpkg.com/',
'rxjs/*': 'https://unpkg.com/@reactivex/rxjs/dist/global/Rx.js'
},ReactiveX git页面建议这个包应该工作,还是缺少其他东西??
在第二个配置中,我得到以下错误
Uncaught (in promise): TypeError: Cannot read property 'call' of undefined发布于 2016-12-02 09:00:43
详细讨论了这个问题,这里和解决方案是使用您自己的加载程序,例如(代码信用nros )。
显然,它将在未来的版本中得到修正--我怀疑这是由于rxjs还处于beta版而被推迟的。
rxjsLoader.js
// see: https://github.com/angular/angular/issues/9359
// in case all parts of RxJS are loaded with a single file (eg: Rx.js), Angular 2 may have
// difficulties using/requiring the various parts.
// this custom loader translates requests to these parts to the already loaded Rx entity.
//
// eg: Angular:
// require('rxjs/observable/from') --> Rx.Observable
// require('rxjs/operator/concatMap') --> Rx.Observable.prototype
// require('rxjs/util/EmptyError') --> Rx
//
// Angular will access 'rxjs/observable/from' as rxjs_observable_from.from
// so, the last part of the included module (eg: 'from') denotes the property name to access
// the required value.
SystemJS.amdDefine(SystemJS.baseURL + "rxjsLoader.js", ["rxjs"], function (Rx) {
'use strict';
// custom loader for RX.js to instantiate the correct value
// see: https://github.com/ModuleLoader/es-module-loader/blob/v0.17.0/docs/loader-extensions.md
return {
fetch: function fetch(loadData) {
return ""; // no fetch - "Rx" is already loaded!
},
translate: function translate(loadData) {
return "";
},
instantiate: function instantiate(loadData) {
// loadData.name contains the full URL
var propertyName = loadData.name.replace(/^.*\/rxjs-parts\/(.*)$/i, "$1").replace(/\.js$/i, "");
// if property name is not empty, evaluate and use it
if (propertyName.length > 0 && !(/^\s*$/.test(propertyName))) {
var parts = propertyName.split("/"),
targetObject = Rx
;
// Angular 2 expects the return value to be an object
// and the last part of the name to be the property of that object
for (var i=0; i < parts.length-1; i++) {
var partName = parts[i],
upperCaseName = partName.charAt(0).toUpperCase() + partName.slice(1)
;
// handle special case for "operator/*"
if (partName === "operator") {
return Rx.Observable.prototype;
} else if (targetObject[partName] !== undefined) {
targetObject = targetObject[partName];
} else if (targetObject[upperCaseName] !== undefined) {
targetObject = targetObject[upperCaseName];
} else {
// skip name and try with next part name. eg: "utils"
continue;
}
}
return targetObject;
} else {
// return the Rx as default
return Rx;
}
}
};
});systemjs-config-using-custom-rx-loader.js
SystemJS.config({
baseURL: '/',
map: {
"rxjs": "Rx.js"
},
paths: {
"Rx.js/*": "rxjs-parts/*"
},
packages: {
"rxjs-parts": {
meta: {
"*": {
loader: "rxjsLoader.js"
}
}
}
}
});发布于 2016-09-30 09:47:39
我有一个plnkr.io演示,用于在TypeScript中使用RxJS来加载捆绑版本,就像您一样。
请参阅:http://plnkr.co/edit/0o9j6h5GJJiCuBFeWv7f
重要的部分是System.config
System.config({
transpiler: 'typescript',
map: {
'rxjs': 'https://unpkg.com/@reactivex/rxjs@5.0.0-beta.12/dist/global/Rx.js'
}
});然后从包中导入任何内容,只需:
import {BehaviorSubject} from 'rxjs';编辑:
更新了默认的Angular2演示程序,以加载单个Rx.js。
现场观看:http://plnkr.co/edit/rnO74mQNuPsHAmrIVJ8j
在systemjs.config.js中,我完全删除了rxjs表单map并添加到paths中
'rxjs*': 'https://unpkg.com/@reactivex/rxjs@5.0.0-beta.12/dist/global/Rx.js'然后我使用它,例如:
import { Component } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Component({
selector: 'my-app',
template: '<h1>My First Angular App</h1>'
})
export class AppComponent {
constructor() {
console.log(BehaviorSubject);
}
}https://stackoverflow.com/questions/39775577
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