小细节调整

html/assets/css/main.css

@@ -22,3 +22,11 @@
   font-size: 10px;
   display: inline-block;
 }
+
+.bottom-placeholder {
+  height: 60px;
+  font-size:13px;
+  color: #999;
+  display: grid;
+  place-items: center;
+}

html/assets/js/isMobile.js

@@ -0,0 +1,24 @@
+function isMobile() {
+    var userAgentInfo = navigator.userAgent;
+
+    var mobileAgents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
+
+    var mobile_flag = false;
+
+    //根据userAgent判断是否是手机
+    for (var v = 0; v < mobileAgents.length; v++) {
+        if (userAgentInfo.indexOf(mobileAgents[v]) > 0) {
+            mobile_flag = true;
+            break;
+        }
+    }
+    // var screen_width = window.screen.width;
+    // var screen_height = window.screen.height;
+
+    // //根据屏幕分辨率判断是否是手机
+    // if (screen_width > 325 && screen_height < 750) {
+    //     mobile_flag = true;
+    // }
+
+    return mobile_flag;
+}