fix: display problem of menu item's title in collapsed state; 🐛

修复：折叠状态下菜单项标题的显示问题；

src/components/menu/menu.js

@@ -134,10 +134,10 @@ export default {
       return h(
         Item, {key: menu.fullPath},
         [
-          h('router-link', {props: {to: menu.fullPath}},
+          h('router-link', {props: {to: menu.fullPath}, attrs: {style: 'overflow:hidden;white-space:normal;text-overflow:clip;'}},
             [
               this.renderIcon(h, menu.meta ? menu.meta.icon : 'none', menu.fullPath),
-              h('span', [this.$t(getI18nKey(menu.fullPath))])
+              this.$t(getI18nKey(menu.fullPath))
             ]
           )
         ]
@@ -145,10 +145,10 @@ export default {
     },
     renderSubMenu: function (h, menu) {
       let this_ = this
-      let subItem = [h('span', {slot: 'title'},
+      let subItem = [h('span', {slot: 'title', attrs: {style: 'overflow:hidden;white-space:normal;text-overflow:clip;'}},
         [
           this.renderIcon(h, menu.meta ? menu.meta.icon : 'none', menu.fullPath),
-          h('span', [this.$t(getI18nKey(menu.fullPath))])
+          this.$t(getI18nKey(menu.fullPath))
         ]
       )]
       let itemArr = []