equire.ensure

equire.ensure（）接受三个参数：

第一个参数的依赖关系是一个数组，代表了当前需要进来的模块的一些依赖;
。第二个参数回调就是一个回调函数其中需要注意的是，这个回调函数有一个参数要求，通过这个要求就可以在回调函数内动态引入其他模块值得注意的是，虽然这个要求是回调函数的参数，理论上可以换其他名称，但是实际上是不能换的，否则的的的的WebPack就无法静态分析的时候处理它;
第三个参数errorCallback比较好理解，就是处理错误的回调;
第四个参数chunkName则是指定打包的组块名称。

        {path: "/CampusLibrary/readProgram",name: "AddBooks",component: r => require.ensure([], () => r(require('@/page/campusLibrary/readProgram')), 'CampusLibrary'),meta: {requireAuth: true, title: '书小虫-阅读计划'}},

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