fixed Object.prototype.toParams

package.json

@@ -1,17 +1,24 @@
 {
   "name": "es.shim",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "实现部分新API, 以及一些常用的扩展方法",
-  "keyworks": ["es5", "es6", "es7", "es2015", "lodash", "polyfill", "extend", "shim"],
+  "keyworks": [
+    "es5",
+    "es6",
+    "es7",
+    "es2015",
+    "lodash",
+    "polyfill",
+    "extend",
+    "shim"
+  ],
   "main": "dist/index.js",
-  "files": ["dist/*"],
+  "files": [
+    "dist/*"
+  ],
   "scripts": {
     "start": "node ./build.js"
   },
-  "exports": {
-    "require": "./dist/index.js",
-    "import": "./dist/index.mjs"
-  },
   "repository": "https://github.com/bytedo/es.shim.git",
   "author": "yutent",
   "license": "MIT"

src/lib/object.js

@@ -30,6 +30,9 @@ if (!Object.prototype.toParams) {
     value: function () {
       var params = ''
       for (let k in this) {
+        if (this[k] === void 0) {
+          continue
+        }
         params += `&${k}=${this[k]}`
       }
       return params.slice(1)