微信小程序父组件向子组件传值

<view class="top">{{title}}</view>

// components/header/header.js
Component({
  properties: {
    // title: String 简写
    title: {
      type: String,
      value: "头部组件" //子组件初始值
    }
  },

  data: {},

  methods: { }
})

<header title="{{head}}"></header>

Page({
  data: {
    head: '我是父组件的数据'
  },