申明變量對象 Object.defineProperty var obj = {'name':'1111','id':'001'},news = null; Object.defineProperty(obj,'obj',{ get:function(){ console.log('get') return news }, set:function(val){ console.log('來取值') news = val } }) // 改變name值 obj.name = 121211 console.log(obj.name) // 輸出新的name Proxy var news = new Proxy(obj,{ get(target,key){ console.log(key,target,'get') return target[key] } }) obj.name = 121211 console.log(obj) // 輸出 {name: 121211, id: 001}