vue 最基础的响应式实现-优快云博客

本文链接：https://blog.youkuaiyun.com/rojie0/article/details/131101765

vue 最基础的响应式实现

//拦截属性
function defineObj(obj) {
  for (let key in obj) {
    // 赋值
    let tempValue = obj[key]
    // 收集依赖的函数
    let funcs = []
    Object.defineProperty(obj, key, {
      get: function () {
        if (window.__func) {
          funcs.push(window.__func)
        }
        return tempValue
      },
      set: function (val) {
        tempValue = val
        for (let i = 0; i < funcs.length; i++) {
          funcs[i]()
        }
      },
    })
  }
}

// 收集依赖自动执行函数
function autoRunFunc(func) {
  window.__func = func
  func()
  window.__func = null
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="/index.js"></script>
</head>

<body>

  <div id="name"> </div>
  <div id="age"> </div>
  姓名：
  <input type="text" oninput="obj.name = this.value">
  <br />
  年龄：
  <input type="text" oninput="obj.age = this.value">

</body>
<script>
  const obj = {
    name: '凯德顺',
    age: '20'
  }

  function showName (params) {
    const nameDom = document.querySelector('#name')
    nameDom.innerHTML = '姓名：' + obj.name
  }

  function showAge (params) {
    const ageDom = document.querySelector('#age')
    ageDom.innerHTML = '年龄：' + obj.age
  }


  defineObj(obj)
  autoRunFunc(showName)
  autoRunFunc(showAge)

</script>

</html>