/**

• 設置監(jiān)聽器
  /
  export function setWatcher(page) {
  let data = page.data;
  let watch = page.watch;
  Object.keys(watch).forEach(v => {
  let key = v.split("."); // 將watch中的屬性以'.'切分成數(shù)組
  let nowData = data; // 將data賦值給nowData
  for (let i = 0; i < key.length - 1; i++) {
  // 遍歷key數(shù)組的元素偶芍，除了最后一個蜈垮！
  nowData = nowData[key[i]]; // 將nowData指向它的key屬性對象
  }
  let lastKey = key[key.length - 1];
  // 假設key==='my.name',此時nowData===data['my']===data.my,lastKey==='name'
  let watchFun = watch[v].handler || watch[v]; // 兼容帶handler和不帶handler的兩種寫法
  let deep = watch[v].deep; // 若未設置deep,則為undefine
  observe(nowData, lastKey, watchFun, deep, page); // 監(jiān)聽nowData對象的lastKey
  });
  }
  /*
• 監(jiān)聽屬性 并執(zhí)行監(jiān)聽函數(shù)
  */
  function observe(obj, key, watchFun, deep, page) {
  var val = obj[key];
  // 判斷deep是true 且 val不能為空 且 typeof val==='object'（數(shù)組內(nèi)數(shù)值變化也需要深度監(jiān)聽）
  if (deep && val != null && typeof val === "object") {
  Object.keys(val).forEach(childKey => {
  // 遍歷val對象下的每一個key
  observe(val, childKey, watchFun, deep, page); // 遞歸調(diào)用監(jiān)聽函數(shù)
  });
  }
  let that = this;
  Object.defineProperty(obj, key, {
  configurable: true,
  enumerable: true,
  set: function(value) {
  watchFun.call(page, value, val); // value是新值址晕，val是舊值
  val = value;
  if (deep) {
  // 若是深度監(jiān)聽,重新監(jiān)聽該對象站叼，以便監(jiān)聽其屬性。
  observe(obj, key, watchFun, deep, page);
  }
  },
  get: function() {
  return val;
  }
  });
  }
  module.exports = {
  setWatcher: setWatcher
  };

-----watch.js------
/**
 * 設置監(jiān)聽器
 */
export function setWatcher(page) {
    let data = page.data;
    let watch = page.watch;
    Object.keys(watch).forEach(v => {
        let key = v.split("."); // 將watch中的屬性以'.'切分成數(shù)組
        let nowData = data; // 將data賦值給nowData
        for (let i = 0; i < key.length - 1; i++) {
            // 遍歷key數(shù)組的元素震叙，除了最后一個栈雳！
            nowData = nowData[key[i]]; // 將nowData指向它的key屬性對象
        }
        let lastKey = key[key.length - 1];
        // 假設key==='my.name',此時nowData===data['my']===data.my,lastKey==='name'
        let watchFun = watch[v].handler || watch[v]; // 兼容帶handler和不帶handler的兩種寫法
        let deep = watch[v].deep; // 若未設置deep,則為undefine
        observe(nowData, lastKey, watchFun, deep, page); // 監(jiān)聽nowData對象的lastKey
    });
}
/**
 * 監(jiān)聽屬性 并執(zhí)行監(jiān)聽函數(shù)
 */
function observe(obj, key, watchFun, deep, page) {
    var val = obj[key];
    // 判斷deep是true 且 val不能為空 且 typeof val==='object'（數(shù)組內(nèi)數(shù)值變化也需要深度監(jiān)聽）
    if (deep && val != null && typeof val === "object") {
        Object.keys(val).forEach(childKey => {
            // 遍歷val對象下的每一個key
            observe(val, childKey, watchFun, deep, page); // 遞歸調(diào)用監(jiān)聽函數(shù)
        });
    }
    let that = this;
    Object.defineProperty(obj, key, {
        configurable: true,
        enumerable: true,
        set: function(value) {
            watchFun.call(page, value, val); // value是新值怯邪，val是舊值
            val = value;
            if (deep) {
                // 若是深度監(jiān)聽,重新監(jiān)聽該對象鸠踪，以便監(jiān)聽其屬性丙者。
                observe(obj, key, watchFun, deep, page);
            }
        },
        get: function() {
            return val;
        }
    });
}
module.exports = {
    setWatcher: setWatcher
};```