方法一:
<img src="{:getImgUrlByPropertyNum($v['num'])}" onerror="this.src='__PUBLIC__/img/swiper1.png'">
方法二:
$(function(){
$('img').error(function(){
console.log('加载不出图片时触发');
$(this).attr("src","../../../Public/images/logo_2.png");
})
})