ionic 图片加载失败，显示默认图片代替

1.首先编写自定义指令

angular.module('starter.directives', [])
//当图片找不到事显示替代图片
   .directive("errSrc", function() {
      return {
         link: function(scope, element, attrs) {
            element.bind("error", function() {
               if (attrs.src != attrs.errSrc) {
                  attrs.$set("src", attrs.errSrc);
               }
            });
         }
      }
   })

2.引用

<img class="icon" ng-src="{{userData._avatar}}" ng-click="loadImage()" id="avatar" err-src="img/default_avatar.png">