錯誤： react native0.57.7版本在整合mobx最新版本包 can't find variable:Symbol

原因：mobx的版本用的最新版本..用到了 Symbol部分es6的api特性.

解決的辦法：

https://github.com/react-community/jsc-android-buildscripts#how-to-use-it-with-my-react-native-app

步驟：

1.Add jsc-android to the "dependencies" section in your package.json

dependencies { "jsc-android": "236355.1.1",}

  npm install

2.在android/build.gradle檔案新增以下內容：

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
         maven { url "https://jitpack.io" }
         maven { url "https://maven.google.com" }
        + maven {
        +      // Local Maven repo containing AARs with JSC library built for Android
        +       url "$rootDir/../node_modules/jsc-android/dist"
        + }
    }
}

3. app's build.gradle 檔案下新增以下內容

+configurations.all {
+    resolutionStrategy {
+        force 'org.webkit:android-jsc:r236355'
+    }
+}

dependencies {
    compile fileTree(dir: "libs", include: ["*.jar"])

這樣接可以了