Javascript 无法使用$http读取json文件
使用$http从文件中读取json:Javascript 无法使用$http读取json文件,javascript,json,node.js,angularjs,Javascript,Json,Node.js,Angularjs,使用$http从文件中读取json: (function(){ var countryApp=angular.module("countryApp",[]); countryApp.controller("CountryCtrl",function($scope,$http){ $http.get('countries.json').success(function(data){
(function(){
var countryApp=angular.module("countryApp",[]);
countryApp.controller("CountryCtrl",function($scope,$http){
$http.get('countries.json').success(function(data){
$scope.countries=data;
});
});
return countryApp;
})();
该文件与html文件位于同一文件夹中,如下所示:
[
{
"name": "China",
"population": 135982100
},
{
"name": "India",
"population": 1205625000
},
{
"name": "United States of America",
"population": 312247000
}
]
这就是错误:
XMLHttpRequest cannot load file:///home/anr/angular_examples/countries.json. Cross origin requests are only supported for HTTP. ex10.html:1
Error: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'file:///home/anr/angular_examples/countries.json'.
at Error (native)
at file:///home/anr/angular_examples/js/angular.js:8380:11
at sendReq (file:///home/anr/angular_examples/js/angular.js:8180:9)
at $http.serverRequest (file:///home/anr/angular_examples/js/angular.js:7921:16)
at wrappedCallback (file:///home/anr/angular_examples/js/angular.js:11319:81)
at wrappedCallback (file:///home/anr/angular_examples/js/angular.js:11319:81)
at file:///home/anr/angular_examples/js/angular.js:11405:26
at Scope.$eval (file:///home/anr/angular_examples/js/angular.js:12412:28)
at Scope.$digest (file:///home/anr/angular_examples/js/angular.js:12224:31)
at Scope.$apply (file:///home/anr/angular_examples/js/angular.js:12516:24) angular.js:9778
尝试创建一个简单的节点服务器:
var express=require('express');
var app=express();
app.use(express.static('../'));
app.listen(3000);
仍将收到此错误:
XHR finished loading: GET "http://localhost:3000/countries.json". angular.js:8380
Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: country in countries, Duplicate key: string:"
http://errors.angularjs.org/1.2.16/ngRepeat/dupes? p0=country%20in%20countries&p1=string%3A%22
at http://localhost:3000/js/angular.js:78:12
at ngRepeatAction (http://localhost:3000/js/angular.js:20025:20)
at Object.$watchCollectionAction [as fn] (http://localhost:3000/js/angular.js:12128:13)
at Scope.$get.Scope.$digest (http://localhost:3000/js/angular.js:12251:29)
at Scope.$get.Scope.$apply (http://localhost:3000/js/angular.js:12516:24)
at done (http://localhost:3000/js/angular.js:8204:45)
at completeRequest (http://localhost:3000/js/angular.js:8412:7)
at XMLHttpRequest.xhr.onreadystatechange (http://localhost:3000/js/angular.js:8351:11) angular.js:9778
出于安全原因,不可能通过ajax读取本地文件。您可以通过本地服务器提供该文件,并从本地主机加载该文件以避免这种情况 从节点查看http服务器模块。您可以使用
npm install--global http server
安装它,然后在.json
文件所在的文件夹中打开控制台。然后运行http服务器-p 1234--cors
,您的.json
文件应该可以从localhost:1234/countries.json
中的浏览器访问(编辑:我假设您已经安装了节点。如果没有,请先安装节点)
在所有这些之后,执行
$http.get(“http://localhost:1234/countries.json“
应该在应用程序内部工作。您最好启动一个简单的web服务器来为您的文件提供服务。例如
$ cd /home/anr/angular_examples
$ python -m SimpleHTTPServer
并打开http://127.0.0.1:8000
在浏览器中
或者,您可以在Chrome:中设置
–允许从文件访问文件标志,这与您在本地加载文件而不使用服务器有关。人们建议为chrome提供一个解决方案。如果使用Firefox,请将标志security.fileuri.strict\u origin\u policy
设置为false
,问题是您在文件://协议上运行文件,这是ex10.html的情况,双击即可加载:),您必须以apache身份通过web服务器才能在http://协议上查看您的文件,然后将加载您的文件。http服务器仅在端口8080上运行,而不管您为其指定的端口是什么。@user2309862您是对的,我的参数错误。它的-p不是--port。看看现在能不能用