vue 报错：Elements in iteration expect to have ‘v-bind:key‘ directives

Vue2.0不同于Vue1.0版本，它把$index和$key都移除了，取而代之的是:key属性。

如果还像之前那样写的话会报Property or method "$index" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property.之类的错误。

Vue1.0版本的写法为：

<ul id="example"><li v-for="item in items">{{$index}}{{$key}}</li>
</ul>

Vue2.0版本的写法为：

<ul id="example"><li v-for="(item,index) in items" :key="item.index">{{item}}{{index}}</li>
</ul>

另一个办法是在build处关闭eslint检测（没试过）

...(config.dev.useEslint ? [createLintingRule()] : []),

参考：https://my.oschina.net/u/3986411/blog/2906924

和 https://www.jianshu.com/p/2cf1a0736154

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