问Ionic:单击事件未被截获

EN

var app = angular.module('mobApp.services');
app.directive('a', function() {
    return {
        restrict: 'E', // only Elements (<a>),
        link: function(scope, elm, attr) {
            elm.on('click', function($event) {
                $event.preventDefault()
                var href = attr.href;
                if(!!href && href !== '#') {
                    window.open(href, '_system', 'location=yes');
                }
                return false
            })
        }
    }
})

<p ng-bind-html="post.details | linky:'_blank'" class="ng-binding">
   <a target="_blank" href="https://davidwalsh.name/speech-recognition" class="">
        https://davidwalsh.name/speech-recognition
   </a>
</p>