chrome52.0.2743.80以上，
accept: { title: ‘Images‘, extensions: ‘jpg,jpeg,png‘, mimeTypes: ‘image/*‘ }
改为
accept: { title: ‘Images‘, extensions: ‘jpg,jpeg,png‘, mimeTypes: ‘image/jpg,image/jpeg,image/png‘ //修改为这样 }
chrome 点击上传文件选择框会延迟几秒才会显示 反应很慢
原文：http://www.cnblogs.com/chjbbs/p/6217480.html