php判断404：
$url = home_url()."/wp-content/themes/twentythirteen/pic/".$result['pic'];
$headers = @get_headers($url);
if(strpos($headers[0],'404') )
{
$url=home_url()."/wp-content/themes/twentythirteen/pic/default.png";
}
js判断404：
var pic_url ="/wp-content/themes/twentythirteen/pic/"+data[i].pic;
$.ajax({
url:pic_url,
error:function(xhr, error, ex){
if (xhr.status == '404') {
pic_url = "/wp-content/themes/twentythirteen/pic/default.png";
}
},
success:function(){
pic_url = pic_url;
}
});
js判断404,要通过ajax......
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn//data/attach/topic/topicKPo7gB.jpg', '推荐 M1996320 的文章《PHP 404判断 与 js 404判断》','https://www.xiaopingtou.net/article-60934.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}