fix(h5): iconPath修改，兼容协议头和无协议情况

src/platforms/h5/components/app/customTabBar.vue

@@ -104,7 +104,9 @@ export default {
   },
   methods: {
     _getRealPath (filePath) {
-      if (filePath.indexOf('/') !== 0) {
+      const SCHEME_RE = /^([a-z-]+:)?\/\//i
+      const DATA_RE = /^data:.*,.*/
+      if (!(SCHEME_RE.test(filePath) || DATA_RE.test(filePath)) && filePath.indexOf('/') !== 0) {
         filePath = '/' + filePath
       }
       return getRealPath(filePath)

src/platforms/h5/components/app/tabBar.vue

@@ -228,6 +228,11 @@ export default {
   },
   methods: {
     _getRealPath (filePath) {
+      const SCHEME_RE = /^([a-z-]+:)?\/\//i
+      const DATA_RE = /^data:.*,.*/
+      if (!(SCHEME_RE.test(filePath) || DATA_RE.test(filePath)) && filePath.indexOf('/') !== 0) {
+        filePath = '/' + filePath
+      }
       return getRealPath(filePath)
     },
     _switchTab ({