ie浏览器有时会出现重复cookie空值，导致getCookie函数出错，所以使用更精确的匹配

src/utils/helper.js

@@ -17,10 +17,10 @@ export function setCookie(name, value, options = {}) {
 }
 
 export function getCookie(name) {
-  const reg = new RegExp(`(^|)${name}=([^;]*)(;|$)`);
+  const reg = new RegExp(`(^|)${name}=([^;]*)(;|$)`, 'g');
   const arr = document.cookie.match(reg); // eslint-disable-line
   if (arr) {
-    return decodeURIComponent(arr[2]);
+    return decodeURIComponent(arr.map(v => v.substring(`${name}=`.length)).filter(v => !!v).pop());
   } else {
     return null;
   }