angularjs 指令scope中“=”、“@”、“&”的区别

HTML

<div ng-controller="MyCtrl">
    <h2>Parent Scope</h2>
    <input ng-model="foo"> <i>// Update to see how parent scope interacts with component scope</i>    
    <br><br>
    <!-- attribute-foo binds to a DOM attribute which is always
    a string. That is why we are wrapping it in curly braces so 
    that it can be interpolated. 
    -->
    <my-component attribute-string="bindAString" attribute-foo="{{foo}}" binding-foo="foo" 
        isolated-expression-foo="updateFoo(newFoo)" >
        <h2>Attribute</h2>
        <div>
            <strong>get:</strong> {{isolatedAttributeFoo}}
        </div>
        <div>
            <strong>set:</strong> <input ng-model="isolatedAttributeFoo">
            <i>// This does not update the parent scope.</i>
            <br>
            <strong>set:</strong> <input ng-model="isolatedBindingString">
            <i>// This does not update the parent scope.</i>
        </div>
        <h2>Binding</h2>
        <div>
            <strong>get:</strong> {{isolatedBindingFoo}}
        </div>
        <div>
            <strong>set:</strong> <input ng-model="isolatedBindingFoo">
            <i>// This does update the parent scope.</i>
            
        </div>
        <h2>Expression</h2>    
        <div>
            <input ng-model="isolatedFoo">
            <button class="btn" ng-click="isolatedExpressionFoo({newFoo:isolatedFoo})">Submit</button>
            <i>// And this calls a function on the parent scope.</i>
        </div>
    </my-component> </div>

JS

var myModule = angular.module('myModule',[])
    .directive('myComponent',function () {
        return {
            restrict:'E',scope:{
                /* NOTE: Normally I would set my attributes and bindings
                to be the same name but I wanted to delineate between 
                parent and isolated scope. */ 
                isolatedBindingString:'@attributeString',isolatedAttributeFoo:'@attributeFoo',isolatedBindingFoo:'=bindingFoo',isolatedExpressionFoo:'&'
            }        
        };
    })
    .controller('MyCtrl',['$scope',function ($scope) {
        $scope.foo = 'Hello!';
        $scope.updateFoo = function (newFoo) {
            $scope.foo = newFoo;
        }
    }]);

代码和效果地址

（编辑：李大同）

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