构造函数 基本使用

相关知识点：

构造函数、原型对象、实例对象

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

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .wrap {
      margin: 50px;
      width: 200px;
      height: 200px;
      border: 1px solid red;
    }

    .active {
      border-color: yellow;
    }
  </style>
</head>

<body>

  <div class="wrap" data-html="hello"></div>
  <script>
    function $(s) {
      return document.querySelector(s);
    }

    function attr(obj, data) {
      return obj.getAttribute(data);
    }

    function ChangeEle(obj) {
      this.ele = obj;
      this.ele.dataHtml = attr(this.ele, 'data-html');
    }

    ChangeEle.prototype.myHtml = function () {
      var ele=this.ele;
      ele.innerHTML = ele.dataHtml;
    }
    ChangeEle.prototype.replaceStr = function (str) {
      var ele=this.ele;
      ele.innerHTML = ele.innerHTML === ele.dataHtml ? str : ele.dataHtml;
    }

    ChangeEle.prototype.addEvent = function (type, fn) {
      this.ele.addEventListener(type, fn);
    }
    var myWrap = new ChangeEle($('.wrap'));
    myWrap.myHtml();
    myWrap.addEvent('click', function () {
      myWrap.replaceStr('world');
    });

  </script>

</body>

</html>
View Code

 

posted @ 2019-04-24 13:54  justSmile2  阅读(204)  评论(0)  编辑  收藏  举报
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