//未使用render函数
Vue.component('anchored-heading', {
 template: '#anchored-heading-template',
 props: {
  level: {
   type: Number,
   required: true
  }
 }
})

//使用render函数
Vue.component('anchored-heading', {
 render: function (createElement) {
  return createElement(
   'h' + this.level,  // tag name 标签名称
   this.$slots.default // 子组件中的阵列
  )
 },
 props: {
  level: {
   type: Number,
   required: true
  }
 }
})

 <div class="btn btn-success" v-if="type === 'success'">{{ text }}</div>
 <div class="btn btn-danger" v-else-if="type === 'danger'">{{ text }}</div>
 <div class="btn btn-warning" v-else-if="type === 'warning'">{{ text }}</div>

export default {
 props: {
  type: {
   type: String,
   default: 'normal'
  },
  text: {
   type: String,
   default: 'normal'
  }
 },
 computed: {
  tag() {
   switch (this.type) {
    case 'success':
     return 1;
    case 'danger':
     return 2;
    case 'warning':
     return 3;
    default:
     return 1;
   }
  }
 },
 render(h) {
  return h('div', {
   class: {
    btn: true,
    'btn-success': this.type === 'success',
    'btn-danger': this.type === 'danger',
    'btn-warning': this.type === 'warning'
   },
   domProps: {
    innerText: this.text
   },
   on: {
    click: this.handleClick
   }
  });
 },
 methods: {
  handleClick() {
   console.log('-----------------------');
   console.log('do something');
  }
 }
};

<Button type="danger" text="test"></Button>

 render() {
  return (
   <div
    class={{
     btn: true,
     'btn-success': this.type === 'success',
     'btn-danger': this.type === 'danger',
     'btn-warning': this.type === 'warning'
    }}
    onClick={this.handleClick}>
    {this.text}
   </div>
  );
 },