ng-bind-html-unsafe的替代

angular 1.2以后（或更早？）移除了ng-bind-html-unsafe，那么我要用这个directive来绑定html代码怎么办？随便一测试，它是不支持把html直接传给它的：

    //html

   <p ng-bind-html="m"></p>



   //js

   $scope.m="<b>text</b>";



   //error:

   [$sce:unsafe] Attempting to use an unsafe value in a safe context.

参考这篇文章，得到解决。我选择的是直接做一个过滤器：

    //js

    app.filter('to_trusted', ['$sce', function ($sce) {

            return function (text) {

                return $sce.trustAsHtml(text);

            };

        }]);

    app.controller...{

        $scope.m="<b>text</b>"

    }   

    //html:

    <p ng-bind-html="m | to_trusted"></p>