get请求params添加null值判断

@@ -25,7 +25,7 @@ service.interceptors.request.use(config => {
     for (const propName of Object.keys(config.params)) {
     for (const propName of Object.keys(config.params)) {
       const value = config.params[propName];
       const value = config.params[propName];
       var part = encodeURIComponent(propName) + "=";
       var part = encodeURIComponent(propName) + "=";
-      if (typeof(value) !== "undefined") {
+      if (value && typeof(value) !== "undefined") {
         if (typeof value === 'object') {
         if (typeof value === 'object') {
           for (const key of Object.keys(value)) {
           for (const key of Object.keys(value)) {
             let params = propName + '[' + key + ']';
             let params = propName + '[' + key + ']';