angularjs - 在 Angular 指令中使用 '&' 范围变量

Question

来自 Angular docs :

& or &attr - provides a way to execute an expression in the context of the parent scope. If no attr name is specified then the attribute name is assumed to be the same as the local name. Given and widget definition of scope: { localFn:'&myAttr' }, then isolate scope property localFn will point to a function wrapper for the count = count + value expression.

这给我的印象是这样的事情应该是可能的，但它不起作用。我做错了什么？

myApp.directive('test', function () {
return {
    restrict: 'E',
    replace: true,
    template: '<div><input type="button" ng-click="thefunc()" value="{{title}}"/></div>',
    scope: {
        title: '@',
        thefunc: '&'
    }
};});

HTML:

<test thefunc="alert('Here you go.')" title="Click me for a popup"/>

Fiddle

Answer 1

Angular 正在寻找 Controller 范围内的“警报”——

$scope.alert = function(){..}

而不是 window.alert

这是一个更新的版本:

http://jsfiddle.net/3CxtZ/4/