JavaScript 字符串原型属性

原型属性允许向现有的 JavaScript 对象类型添加新的属性和方法。有两个示例来描述 JavaScript 字符串原型属性。

句法：

object.prototype.name = value

返回值：它返回对String.prototype对象的引用。

示例 1：此示例向所有对象添加属性工资。

  

    
        JavaScript String prototype Property
    

  

  
    GeeksForGeeks
      
    
  
    
        Click Here
    
      
    
      
    
        var up = document.getElementById('GFG_UP');
        var down = document.getElementById('GFG_DOWN');
          
        function person(name, age) {
            this.name = name;
            this.age = age;
        }
        var p1 = new person("p1", 24);
        up.innerHTML = "Click on the button to add "
                + "a new property to all objects of"
                + " a given type.< br > " 
                + JSON.stringify(p1);
  
        function GFG_Fun() {
            person.prototype.salary = 1000;
            down.innerHTML = p1.salary;
        }
    

  
 

输出：

示例 2：此示例向所有对象添加了一个方法信息。

  

    
        JavaScript String prototype Property
    

  

  
    GeeksForGeeks
  
    
  
    
        Click Here
    
      
    
      
    
        var up = document.getElementById('GFG_UP');
        var down = document.getElementById('GFG_DOWN');
        function person(name, age) {
            this.name = name;
            this.age = age;
        }
        var p1 = new person("p1", 22);
        up.innerHTML = "Click on the button to add"
                + " a new property to all objects "
                + "of a given type.< br > " 
                + JSON.stringify(p1);
  
        function getData(name, age) {
            return "Information of person <br>Name - '" 
                        + name + "'<br>Age - " + age;
        }
  
        function GFG_Fun() {
            person.prototype.info 
                    = getData(p1.name, p1.age);
                      
            down.innerHTML = p1.info;
        }
    

  
 

输出：