vue js default prop

1  props: {
2    title: String,
3    default: function () {
4      return "John Doe";
5    },
6  },

1props: {
2  name: {
3    type: String,
4    default: 'John Doe'
5  }
6}

1    props: {
2        users_count: {
3            type: [Number, String],
4            required: true
5        }
6    }, 

1export default {
2  name: 'Camera',
3  props: ['name', 'img'],
4}

1<!-- Dynamically assign the value of a variable -->
2<blog-post v-bind:title="post.title"></blog-post>
3
4<!-- Dynamically assign the value of a complex expression -->
5<blog-post
6  v-bind:title="post.title + ' by ' + post.author.name"
7></blog-post>