JavaScript implementation of accessing object properties (getting/setting property values)-JS Tutorial-php.cn

JavaScript implementation of accessing object properties (getting/setting property values)

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Release： 2018-11-30 16:53:04

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通过在JavaScript implementation of accessing object properties (getting/setting property values) implementation of accessing object properties (getting/setting property values) implementation of accessing object properties (getting/setting property values)中定义对象，可以像类一样实现封装，在本文中将给大家介绍如何编写代码来访问对象属性，下面我们来看具体的内容。

JavaScript implementation of accessing object properties (getting/setting property values) implementation of accessing object properties (getting/setting property values) implementation of accessing object properties (getting/setting property values)

我们先来看一下格式

(对象的实例名称).(属性名称)

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我们来看具体的示例

代码如下

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript">
function product() {
      this.name = "LemonCandy";
      this.price = 150;
      this.getInfo = function(){
      return this.name + " = \\" + this.price;
          }
        }
        window.onload = function onLoad() {
            target = document.getElementById("output");
            prod = new product();
            target.innerHTML = "name:" + prod.name + "<br/>";
            target.innerHTML += "price:" + prod.price + "<br/>";
        }
  </script>
</head>
<body>
  <div id="output"></div>
</body>
</html>

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说明

function product() {
    this.name = "LemonCandy";    
    this.price = 150;    
    this.getInfo = function(){      
    return this.name + " = \\" + this.price;
    }
  }

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上面的代码是对象的定义，在这个例子中，我们实现了name，price属性和getInfo（）方法。

window.onload = function onLoad() {
      target = document.getElementById("output");
      prod = new product();
      prod.name = "LemonCandy2";
      target.innerHTML = "name:" + prod.name + "<br/>";
      target.innerHTML += "price:" + prod.price + "<br/>";
  }

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加载页面时，执行上面的代码。

prod = new product();

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创建对象的实例。

prod.name = "LemonCandy2";

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(对象的实例名称).(属性名称)用于访问对象的属性。要为属性设置值，需要通过替换设置属性值

 target.innerHTML = "name:" + prod.name + "<br/>";
      target.innerHTML += "price:" + prod.price + "<br/>";

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(对象的实例名称).(属性名称)用于访问对象的属性。属性的值显示在页面上。

运行结果

当Web浏览器显示上述HTML文件时，将显示如下所示的效果。可以确认设定的属性值和从属性中获取值。

接下来我们再来看一个例子

代码如下

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript">
var obj = {
      name: "LemonCandy",
      price: 150,
      getInfo: function () {
        return this.name + " = \\" + this.price;
      }
    }
    window.onload = function onLoad() {
      target = document.getElementById("output");
      obj.name = "LemonCandy2";
      obj.price = 220;
      target.innerHTML = "name:" + obj.name + "<br/>";
      target.innerHTML += "price:" + obj.price + "<br/>";
    }
  </script>
</head>
<body>
<div id="output"></div>
</body>
</html>

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说明

var obj = {
    name: "LemonCandy",    
    price: 150,    
    getInfo: function () {
          return this.name + " = \\" + this.price;
    }
  }

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上面的代码是对象的定义。在这个例子中，我们实现了name，price属性和getInfo（）方法。它是以简单的格式编写的。

window.onload = function onLoad() {
    target = document.getElementById("output");
    obj.name = "LemonCandy2";
    obj.price = 220;
    target.innerHTML = "name:" + obj.name + "<br/>";
    target.innerHTML += "price:" + obj.price + "<br/>";
  }

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加载页面时，执行上面的代码。代码与例1中的代码相同，处理内容相同。因为使用的是简单的类型的对象定义的格式，不存在由new命令创建一个实例部分这与例1中的代码不同。

运行结果

当Web浏览器显示上述HTML文件时，将显示如下所示的效果，确认可以将值设置为属性并从属性中获取值。

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