add nav

data/page4.js

@@ -178,5 +178,11 @@ module.exports = {
           desc: '独特且强悍的JavaScript算法，能极速压缩80%的图片大小，而不损害其质量',
           link: 'https://www.picdiet.com/zh-cn',
         },
+        {
+          icon: './icon/page4/icon-4x027.png',
+          name: 'easyicon',
+          desc: '在线图标转换ico、icns',
+          link: 'https://www.easyicon.net/covert/',
+        },
     ]
 }
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