JavaScript——類的根據屬性名_獲取/修改_屬性

通過傳入的類屬性名獲取、修改對應的類屬性：

    var label_set =  '';
    var type_set =   '';
    var labelOption = '';      
    class Service_data{
        constructor() {
            //固定屬性
            this.conversationCount =  {name:'會話數',type:type_set, label: label_set ,data: []};
            this.doubleConversationCount =  {name: '兩人會話總數', type: type_set,  label: label_set ,data: []};
            this.temporaryConversationCount =  {name: '臨時多人會話', type: type_set,  label: label_set ,data: []};
            this.groupConversationCount =  {name: '群組會話總數', type: type_set , label: label_set , data: []};
            this.informationNumCount =  {name: '資訊號總數', type: type_set , label: label_set , data: []};
            this.informationCount =  {name: '資訊總數', type: type_set , label: label_set , data: []};
            this.informationReadCount =  {name: '閱讀數', type: type_set ,  label: label_set,data: []};
            this.informationCommentCount =  {name: '資訊評論數', type: type_set , label:label_set , data: []};
            this.informationPraiseCount =  {name: '資訊點贊總數', type: type_set , label: label_set, data: []};
            this.colleaguesCount =  {name: '同事圈總數', type: type_set ,  label: label_set,data: []};
            this.colleaguesCommentCount =  {name: '同事圈評論總數', type: type_set , label:label_set, data: []};  
        }
        setdata(name,list){
            if(this.hasOwnProperty(name)){
                let save_data = Object.getOwnPropertyDescriptor(this,name).value;
                save_data.data = list;
            }else{
                console.log(name+"沒有對應屬性！");
            }
        }
        getdata(name){
            if(this.hasOwnProperty(name)){
                return Object.getOwnPropertyDescriptor(this,name).value;
            }else{
                console.log(name+"沒有對應屬性！");
            }
        }
    }
    var service_dataInit = new Service_data();
    var setdata_resule = service_dataInit.setdata('conversationCount',['1','2']);
    var getdata_resule = service_dataInit.getdata('conversationCount');
    console.log(getdata_resule);    

 

使用方法：

 

Object.getOwnPropertyDescriptor() 方法返回指定對象上一個自有屬性對應的屬性描述符。（自有屬性指的是直接賦予該對象的屬性，不需要從原型鏈上進行查找的屬性）

參數

obj

需要查找的目標對象

prop

目標對象內屬性名稱（String類型）

返回值

如果指定的屬性存在於對象上，則返回其屬性描述符對象（property descriptor），否則返回 undefined。

---

 

hasOwnProperty() 方法會返回一個布爾值，指示對象自身屬性中是否具有指定的屬性

參數

prop

要檢測的屬性   字符串 名稱或者 Symbol。

返回值

用來判斷某個對象是否含有指定的屬性的 Boolean 。