JS原型添加属性与方法-优快云博客

本文链接：https://blog.youkuaiyun.com/u011301203/article/details/78460914

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<meta name="x5-fullscreen" content="true">
		<title>js原型添加属性与方法</title>
		<style>
			
			div{
				height: 100px;
				width: 100px;
				border: 1px solid red;
			}
			
		</style>
	</head>
	<body>
		
		<div onclick="moudel.fn(123)"></div>
	
		
		<script>
			
			var moudel = new Object({
				projectUrl:"http://wxkf.5ifapiao.com",
				name : 123,
				fn : function(a){
					console.log(a);
				}
			})
			
			//构造函数
			function Dog(name,age){
				this.name = name;
				this.age = age;
			}
			
			//在函数原型链上添加属性和方法
			Dog.prototype.type = '狗';
			Dog.prototype.fun = function(){
				console.log('吃骨头');
			}
			
			//实例化对象
			var dog = new Dog('毛毛','1岁');
			console.log(dog.name);
			console.log(dog.type);
			dog.fun();
			
			
			//属性探测
			// in : 操作符会检查自有属性和原型属性
			// hasOwnProperty : 只检测自有属性
			console.log( 'name' in Dog);     //true
			console.log( 'toString' in Dog); //true
			
			console.log( Dog.hasOwnProperty('name'));     //true
			console.log( Dog.hasOwnProperty('toString')); //false
			
			//删除属性
//			delete dog.name; // true
			
			console.log(Object.getOwnPropertyDescriptor(moudel,'name'));
			
			
        
		</script>
		
		
	</body>
</html>

js 原型