fix(midway-web): path might be numeric string within safelyGet()

- safelyGet(['a','1'], {a: {"1": 2}})  // => 2
- safelyGet(['a','1'], {a: {b: 2}})  // => undefined

packages/midway-web/src/utils.ts

@@ -49,6 +49,8 @@ export function isTypeScriptEnvironment(): boolean {
 /**
  *  safelyGet(['a','b'],{a: {b: 2}})  // => 2
  *  safelyGet(['a','b'],{c: {b: 2}})  // => undefined
+ *  safelyGet(['a','1'],{a: {"1": 2}})  // => 2
+ *  safelyGet(['a','1'],{a: {b: 2}})  // => undefined
  *  safelyGet('a.b',{a: {b: 2}})  // => 2
  *  safelyGet('a.b',{c: {b: 2}})  // => undefined
  */
@@ -57,7 +59,7 @@ export function safelyGet(list: string | string[], obj?: object): any {
     return (_obj: object) => safelyGet(list, _obj);
   }
 
-  if (typeof obj === 'undefined' || obj === null) {
+  if (typeof obj === 'undefined' || typeof obj !== 'object' || obj === null) {
     return void 0;
   }
   const pathArrValue = typeof list === 'string' ? list.split('.') : list;
@@ -67,6 +69,9 @@ export function safelyGet(list: string | string[], obj?: object): any {
     if (typeof willReturn === 'undefined' || willReturn === null) {
       return void 0;
     }
+    else if (typeof willReturn !== 'object') {  // for willReturn is string and key is numeric string
+      return void 0;
+    }
     willReturn = willReturn[key];
   }