//自定义ngModel的属性

     .directive('contenteditable', ['$window', function() {

         return {

             restrict: 'A',

             require: '?ngModel', // 此指令所代替的函数

             link: function(scope, element, attrs, ngModel) {

                 if (!ngModel) {

                     return;

                 } // do nothing if no ng-model

                 // Specify how UI should be updated

                 ngModel.$render = function() {

                     element.html(ngModel.$viewValue || '');

                 };

                 // Listen for change events to enable binding

                 element.on('blur keyup change', function() {

                     scope.$apply(readViewText);

                 });

                 // No need to initialize, AngularJS will initialize the text based on ng-model attribute

                 // Write data to the model

                 function readViewText() {

                     var html = element.html();

                     // When we clear the content editable the browser leaves a <br> behind

                     // If strip-br attribute is provided then we strip this out

                     if (attrs.stripBr && html === '<br>') {

                         html = '';

                     }

                     ngModel.$setViewValue(html);

                 }

             }

         }

     }])

 <div class="icon-arrow-title title-color-2" contenteditable="true" ng-model="param.MobileNum" style="right: 15px;"></div>