!497 增加对空字符串参数的过滤

Merge pull request !497 from root/master

@@ -207,10 +207,10 @@ export function tansParams(params) {
   for (const propName of Object.keys(params)) {
   for (const propName of Object.keys(params)) {
     const value = params[propName];
     const value = params[propName];
     var part = encodeURIComponent(propName) + "=";
     var part = encodeURIComponent(propName) + "=";
-    if (value !== null && typeof (value) !== "undefined") {
+    if (value !== null && 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)) {
-          if (value[key] !== null && typeof (value[key]) !== 'undefined') {
+          if (value[key] !== null && value !== "" && typeof (value[key]) !== 'undefined') {
             let params = propName + '[' + key + ']';
             let params = propName + '[' + key + ']';
             var subPart = encodeURIComponent(params) + "=";
             var subPart = encodeURIComponent(params) + "=";
             result += subPart + encodeURIComponent(value[key]) + "&";
             result += subPart + encodeURIComponent(value[key]) + "&";