TypeError：$ scope.scanBarcode不是离子功能

Question

我试图显示一个日志消息，当用户点击按钮。而是这个错误显示出来：

TypeError: $scope.scanBarcode is not a function 
at new <anonymous> (controllers.js:8) 
at Object.instantiate (ionic.bundle.js:18015) 
at $controller (ionic.bundle.js:23417) 
at Object.self.appendViewElement (ionic.bundle.js:59908) 
at Object.render (ionic.bundle.js:57901) 
at Object.init (ionic.bundle.js:57821) 
at Object.self.render (ionic.bundle.js:59767) 
at Object.self.register (ionic.bundle.js:59725) 
at updateView (ionic.bundle.js:65400) 
at ionic.bundle.js:65377 
(anonymous) @ ionic.bundle.js:26799 

这里是我的controller.js代码：

angular.module('app.controllers', []) 
.controller('page4Ctrl', ['$scope', '$stateParams', function ($scope, $stateParams) { 
$scope.scanBarcode() = function() 
{ 
    console.log("hello"); 
}; 

}]) 

，这里是我的html代码：

<ion-view title="Page1" id="page18"> 
<ion-content padding="true" class="has-header"> 
<button id="page4-button4" class="button button-positive button-block" ng-click="scanBarcode()">Scan</button> 
<button id="page4-button5" class="button button-positive button-block">Display Scanned Data</button> 

可能是什么问题？

Answer 1

我想你已经定义了错误的功能。不要在函数名后使用()即scanBarcode

试试这个：

$scope.scanBarcode = function()//no() after the name 
{ 
    console.log("hello"); 
};