Vue的三种按需加载方式

{
	path: '/promisedemo',
	name: 'PromiseDemo',
	component: resolve => require(['../components/PromiseDemo'], resolve)
}

// 没有指定webpackChunkName，每个组件打包成一个js文件；
// 指定了相同的webpackChunkName，会合并打包成一个js文件
{
  path: '/importfuncdemo1',
  name: 'ImportFuncDemo1',
  component: import('../components/ImportFuncDemo1')
}

{
  path: '/promisedemo',
  name: 'PromiseDemo',
  component: resolve => require.ensure([], () => resolve(require('../components/PromiseDemo')), 'demo')
},