例如在表单提交的场景，用户敲击回车键实现登录操作：
<!DOCTYPE html>
<html ng-app="app">
<head>
<title>angular</title>
<meta charset="utf-8">
<script src="angular.js"></script>
</head>
<body>
<div ng-controller="test">
<input type="text" my-enter="doSomething()">
</div>
<script>
var app = angular.module('app', []);
app.controller('test', function($scope) {
$scope.doSomething = function(){
console.log("test")
}
});
app.directive('myEnter', function () {
return function (scope, element, attrs) {
element.bind("keydown keypress", function (event) {
if(event.which === 13) {
scope.$apply(function (){
scope.$eval(attrs.myEnter);
});
event.preventDefault();
}
});
};
});
</script>
</body>
</html>