Update push-vue.js

Author: walkor

src/push-vue.js

@@ -693,7 +693,7 @@ function __ajax(options) {
     options = options || {};
     options.type = (options.type || 'GET').toUpperCase();
     options.dataType = options.dataType || 'json';
-    params = formatParams(options.data);
+    var params = formatParams(options.data);
 
     var xhr;
     if (window.XMLHttpRequest) {
@@ -729,4 +729,4 @@ function formatParams(data) {
         arr.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[name]));
     }
     return arr.join('&');
-}
+}