How to determine whether there is a thumbnail in dedecms 5.1

dedecms 5.1 How to determine whether there is a thumbnail?

Sometimes because there is no official website, and the implementation of an empty address is not good-looking, it is also a good method not to display the thumbnail if it does not exist.

Recommended study: 梦Weavercms

Whether the official website is judged:

{dede:field name='officialurl' runphp='yes'} 
if(@me == "") @me = "未知官方";else @me = "<a href=".@me." target=_blank>官方网址</a>"; 
{/dede:field

Whether the demonstration address is judged:

{dede:field name='officialdemo' runphp='yes'} 
if(@me == "") @me = "无演示";else @me = "<a href=".@me." target=_blank>演示地址</a>"; 
{/dede:field}

Determine whether the thumbnail is present or not:

{dede:field name='litpic' runphp='yes'} 
if(@me == "/do/plus/img/dfpic.gif") @me = "";else @me = "<a href=".@me." target=_blank title=新窗口查看图片><img src=".@me."  /></a>"; 
{/dede:field}

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