Detailed explanation of Vue mixin usage and option merging

<template>
  <div class="event_style">
    <h2>Basics</h2>
    <div class="inner_children">
      <span>{{ message }}</span>
    </div>
  </div>
</template>
<script>
var myMixin = {
  data() {
    return {
      message: "",
    };
  },
  created: function () {
    console.log("created:add mixin");
    this.message = "created:add mixin";
    this.hello();
  },
  methods: {
    hello: function () {
      console.log("hello from mixin!");
    },
  },
};
// Define a component that uses a mixin object export default {
  name: "mixin-basic",
  mixins: [myMixin],
};
</script>

<template>
  <div class="event_style">
    <h2>Options Merge</h2>
    <div class="inner_children">
      <span>{{ message }}</span>
      <span>{{ message1 }}</span>
    </div>
  </div>
</template>
<script>
var myMixin = {
  data() {
    return {
      message: "mixin:mixin",
      message1: "mixin:mixin-1",
    };
  },
  created: function () {
    this.hello();
  },
  methods: {
    hello: function () {
      console.log("mixin:hello from mixin!");
    },
  },
};
// Define a component that uses a mixin object export default {
  name: "mixin-merge",
  mixins: [myMixin],
  data() {
    return {
      message: "Component: hello",
    };
  },
  created: function () {
    this.hello();
  },
  methods: {
    hello: function () {
      console.log("Component: hello world!");
    },
  },
};
</script>
<style scoped>
.event_style {
  padding-left: 50px;
  padding-right: 50px;
}
.inner_children {
  display: flex;
  flex-direction: column;
  height: 150px;
  border: 1px solid #333;
  padding: 6px;
}
.inner_children span {
  font-size: 20px;
}
</style>