我叫大王来巡山

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<!DOCTYPE html>
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>proxyVue</title>
  <style>
    #app {
            margin: 100px auto 0 auto;
            width: 300px;
        }
        #btn {
            margin: 10px auto;
        }
    </style>
</head>
 
<body>
  <div id="app">
    <input type="text" v-model="num" />
    <input id="btn" type="button" value="添加到Todolist" v-click="addList" /><br />
    <span>您输入的是:</span><span v-bind="num"></span><span>{{num}}</span>
    <ul id="list"></ul>
  </div>
</body>
 
<script>
  class proxyVue {
    constructor(options) {
      this.$options = options || {};
      this.$methods = this._methods = this.$options.methods;
      const data = (this._data = this.$options.data);
      this.subscribe = {};
      this.observe(data);
      this.compile(options.el);
    }
    publish(watcher) {
      if (!this.subscribe[watcher.property])
        this.subscribe[watcher.property] = [];
      this.subscribe[watcher.property].push(watcher);
    }
    observe(data) {
      const that = this;
      let handler = {
        get(target, property) {
          return target[property];
        },
        set(target, property, value) {
          let res = Reflect.set(target, property, value);
          that.subscribe[property].map(item => {
            item.update();
          });
          return res;
        }
      };
      this.$data = new Proxy(data, handler);
    }
    compile(el) {
      const nodes = Array.prototype.slice.call(
        document.querySelector(el).children
      );
      let data = this.$data;
      nodes.map(node => {
        if (node.children.length > 0) this._complie(node);
        if (node.hasAttribute("v-bind")) {
          let property = node.getAttribute("v-bind");
          this.publish(new Watcher(node, "innerHTML", data, property));
        }
        if (node.hasAttribute("v-model")) {
          let property = node.getAttribute("v-model");
          this.publish(new Watcher(node, "value", data, property));
          node.addEventListener("input", () => {
            data[property] = node.value;
          });
        }
        /**
         self ...
        */
        if (/\{\{(.*?)\}\}/.test(node.innerHTML)) {
          let ret = /\{\{(.*?)\}\}/.exec(node.innerHTML)
          let property = ret[1];
          this.publish(new Watcher(node, "innerHTML", data, property));
        }
        // self end
        if (node.hasAttribute("v-click")) {
          let methodName = node.getAttribute("v-click");
          let mothod = this.$methods[methodName].bind(data);
          node.addEventListener("click", mothod);
        }
      });
    }
  }
  class Watcher {
    constructor(node, attr, data, property) {
      this.node = node;
      this.attr = attr;
      this.data = data;
      this.property = property;
    }
    update() {
      this.node[this.attr] = this.data[this.property];
    }
  }
 
  // 渲染todolist列表
  const Render = {
    // 初始化
    init: function (arr) {
      const fragment = document.createDocumentFragment();
      for (let i = 0; i < arr.length; i++) {
        const li = document.createElement("li");
        li.textContent = arr[i];
        fragment.appendChild(li);
      }
      list.appendChild(fragment);
    },
    addList: function (val) {
      const li = document.createElement("li");
      li.textContent = val;
      list.appendChild(li);
    }
  };
 
  // 实例化一个proxyVue
  window.onload = function () {
    let vm = new proxyVue({
      el: "#app",
      data: {
        num: 0,
        arr: []
      },
      methods: {
        addList() {
          this.arr.push(this.num);
          // Render.addList(this.num);
        }
      }
    });
  };
</script>
 
</html>

  

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