angularJS使用$http.post()往后台发送数据时，包括{c:$scope.code}，但只在input绑定ng-model="code"，不申明，不赋值，为什么后台就接不到c呢？
<!DOCTYPE html>
<html ng-app="test">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="angular.js"></script>
<script>
var app=angular.module("test",[]);
app.controller('get', ['$http','$scope', function($http,$scope){
$scope.ajax=function (){
$http.post('a.php',{
a:'123',
b:'as',
c:$scope.code
}).then(function (res){
console.log(res);
},function (res){
console.log(res);
});
};
}]);
</script>
</head>
<body ng-controller="get">
<input type="text" ng-model="code"><button ng-click="ajax()">点击</button>
</body>
</html>yuanfengjituan
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