js - 02課 4 淺談this -3

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1.兩種方式綁定, this 不同的指向

<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title></title>    <style>        li{width: 100px; height:150px;float:left; margin-right:30px; background: #f1f1f1;position: relative; z-index: 1;}        div{width: 80px; height:200px; background:red; position: absolute; top:75px;left:10px;display: none}    </style></head><body><ul>    <li>        <div></div>    </li>    <li>        <div></div>    </li>    <li>        <div></div>    </li></ul><script>    window.onload = function(){        var aLi = document.getElementsByTagName(‘li‘)        for(var i = 0; i < aLi.length; i++){            aLi[i].onmouseover = function(){                var _this = this;                showDiv(_this);            }            aLi[i].onmouseout = hideDiv;        }    }    function showDiv(_this){        _this.getElementsByTagName(‘div‘)[0].style.display = ‘block‘;    }    function hideDiv(){        this.getElementsByTagName(‘div‘)[0].style.display = ‘none‘;    }</script></body></html>

  

js - 02課 4 淺談this -3

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