Generally，component is a entity Widget in Weex engine, and it can be loaded if confirm to some details rules whlile the Weex engine init. It can display some detail contents, receive touch or other custom events, custom attributes. There are some internal components registered such as div, image and text, you can custom your own component if these can not meet your needs.
you can call custom methods for a entity component after adding ref attributes, for example:
<template> <mycomponent ref='mycomponent'></mycomponent> </template> <script> module.exports = { created:function() { this.$refs.mycomponent.focus(); } } </script>