AngularJs解决跨域问题案例详解(简单方法)

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AngularJs解决跨域问题案例详解(简单方法)_AngularJS

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May 23, 2016 pm 01:15 PM

首先我们做点准备说明，不然你明白我说的是啥意思别人不明白，就算别人明白了那总有人不明白，那你要说了，我的意思是这个说明必须要做了，答案是必须的，为了更好的方便大家理解嘛。

我们以两个主域名或者一个主域名+一个二级域名为例，均可演示跨域问题。

客户端 a.com

服务端 b.com或者s.a.com

angularJs版本 V1.2.25

准备工作做得很充分嘛，就差把我们的编辑器是subline暴露出来了，这个一般人我是不告诉他滴。

有人嚷嚷了，这问题老早就有了，你现在提出来有啥意义呢？难不成你还能把花忽悠开了？嗯，我还真能把花写开了。看戏吧，我们本篇要上演的是完整版跨域实例。

接下来我们先看客户端是如何请求数据的

注意哦，我们的代码是写在a.com域名下面的

<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
<meta charset="UTF-8">
<title></title>
<script src="./angular.min.js"></script>
<script type="text/javascript">
var app = angular.module('app', []);
app.controller('appCtrl', ['$scope', function ($scope) {
$http({
method: 'JSONP',
url: 'http://www.b.com/test.php&#63;callback=JSON_CALLBACK',
}).success(function (msg) {
console.log(data);
});
//或者
$http
.jsonp('http://www.b.com/test.php&#63;callback=JSON_CALLBACK')
.success(function (msg){
console.log(msg);
}); 
}]);
</script>
</head>
<body>
</body>
</html>

我们看到，这里是直接以jsonp的形式进行跨域请求的，其操作同jquery中对跨域的请求方式如出一辙。注意，我们的callback是固定的，即JSON_CALLBACK，尽量不要去做任何改动

我们再看服务端b.com中的test.php对请求数据的处理方式，这里以原生php的方式做参考

$callBack = isset($_GET['callback']) &#63; $_GET['callback'] : DEFAULT_CALLBACK;
exit($callBack.'('.json_encode($data).')');

我们再回来看看客户端console.log记录的结果

到此，也就是说我们跨域请求是成功的！

最后我们做个小总结，注意下其中的重点：

1.客户端跨域请求的url后追加的参数是?callback=JSON_CALLBACK，参数callback的值指定为JSON_CALLBACK，注意是大写，就是JSON_CALLBACK不要作任何改动，感觉这里是个不小的坑，?callback的值稍作改动，客户端就需要全局定义callback函数，而且还特么怎么再传给$scope处理？为了避免不必要的麻烦，这里建议就这么搞吧

2.再看服务端，服务端需要指定$callBack = $_GET['callback'];接收callback,而且你还会发现接收的callback不是我们客户端写的?callback的值，客户端指定JSON_CALLBACK应该是为了触发angularJs内部的机制

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