封装事件框架 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background: red;
        }
    </style>
</head>
<body>
<button id="btn">按钮</button>
<div id='div'></div>
</body>
<script src='itcast.js'></script>
<script type="text/javascript">

    //测试
    $$.event.click('btn', function(){
        document.getElementsByTagName('div')[0].style.background = 'green'
    });

    $$.event.mouseover('div', function(){
        this.style.background = 'blue'
    });

    $$.event.mouseout('div', function(){
        this.style.background = 'pink'
    });

</script>
</html>

使用 extend 改造

$$.hover('div'   ,   function(){  }  ,  function(){  } ) ;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background: red;
        }
    </style>
</head>
<body>
<button id="btn">按钮</button>
<div id='div'></div>
</body>
<script src='itcast2.js'></script>
<script type="text/javascript">

    //测试
    $$.click('btn', function(){
        document.getElementsByTagName('div')[0].style.background = 'green'
    });

    $$.hover('div', function(){                    
        this.style.background = 'blue'
    },function(){
        this.style.background = 'pink'
    });

</script>
</html>

 

posted @ 2019-09-28 22:15  shanlu  阅读(173)  评论(0)  编辑  收藏  举报