JavaScript ES5 对象方法

javascript 中的ES5 Object 方法用于查找更多与对象交互的方法。
ES5 Object 方法可以做：

• 防止枚举
• 操纵
• 删除
• 防止添加新功能
• getter 和 setter

句法：

Object.defineProperty(object, property, {value : value})

以下元数据值可以为真或假：

• 可写
• 可枚举的
• 可配置

获取所有属性的示例：

  

    
        
            Geeksforgeeks
            The properties of the object are:
  
            
        
    
  
    
        var person = {
            name: "xyz",
            address: "noida",
            language: "hindi"
        }
        // Change Property
        Object.defineProperty(person, 
            "language", { enumerable: false });
  
        document.getElementById("demo").innerHTML
            = Object.getOwnPropertyNames(person);
    

  

获取可枚举属性的示例：

  

    
        
            Geeksforgeeks
            The properties of the object are:
  
            
        
    
  
    
        var person = {
            name: "xyz",
            address: "noida",
            language: "hindi"
        }
  
        // Change Property
        Object.defineProperty(person, 
            "language", { enumerable: false });
  
        document.getElementById("demo")
            .innerHTML = Object.keys(person);
    

  

添加属性的示例：

  

    
        
            Geeksforgeeks
            
                The mobno property is added and 
                the value of that property is:
            
  
            
        
    
  
    
        var person = {
            name: "xyz",
            address: "noida",
            language: "hindi"
        }
  
        Object.defineProperty(person, 
            "mobno", { value: "979889xxxx" });
  
        // Display Properties
        document.getElementById("demo")
            .innerHTML = person.mobno;