一个祖传老代码打包，提示如下错误：
ReferenceError: webpackJsonp is not defined
at http://localhost:8100/build/main.js:1:1
一搜发现应该是使用了新版本的Ionic-App-Scripts导致的：
This is a breaking change in Ionic-App-Scripts
https://github.com/ionic-team/ionic-app-scripts/releases/tag/v2.0.0src/index.html must be modified to include a new vendor script tag .
中文意思是：这版本有一个断式变更，src/index.html文件需要一个包含vendor script的标签，即需要添加这一段：
<script src="build/vendor.js"></script>
而且必须要放在<script src="build/main.js"></script>前面，完成后如下：
...
<body>
<!-- Ionic's root component and where the app will load -->
<ion-app></ion-app>
<script src="cordova.js"></script>
<!-- The polyfills js is generated during the build process -->
<script src="build/polyfills.js"></script>
<!-- all code from node_modules directory is here -->
<script src="build/vendor.js"></script>
<!-- The bundle js is generated during the build process -->
<script src="build/main.js"></script>
</body>
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