JS高级---体会面向对象和面向过程的编程思想

时间 2019-12-28

原文原文链接

体会面向对象和面向过程的编程思想

ChangeStyle是自定义的构造函数，再经过原型添加方法的函数。html

实例化对象，导入json参数，和建立cs，调用原型添加的方法函数编程

过渡，先熟悉记忆json

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>title</title>
  <style>
    div {
      width: 300px;
      height: 200px;
      background-color: red;
    }
  </style>
</head>

<body>
  <input type="button" value="显示效果" id="btn" />
  <div id="dv"></div>
  <script src="common.js"></script>
  <script>


    function ChangeStyle(btnObj, dvObj, json) {
      this.btnObj = btnObj;
      this.dvObj = dvObj;
      this.json = json;
    }
    ChangeStyle.prototype.init = function () {
      //点击按钮，改变div多个样式属性值
      var that = this;
      this.btnObj.onclick = function () {
        for (var key in that.json) {
          that.dvObj.style[key] = that.json[key];
        }
      };
    };

    //实例化对象
    var json = { "width": "500px", "height": "300px", "backgroundColor": "blue" }
    var cs = new ChangeStyle(my$("btn"), my$("dv"), json);
    cs.init();//调用方法
  </script>
</body>

</html>