lovecoding
/
W250913


			
							12345678910111213141516171819202122232425262728293031323334353637383940
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box2{
            color: red;
        }
    </style>
</head>
<body>
    <div class="box" id="div1">hello</div>
    <img src="" alt="图片">
    <script>
        var oBox = document.getElementById("div1");
        var oImg = document.getElementsByTagName("img")[0];
        oBox.onmouseover = function(){
            // setAttribute 方法 用来设置元素的属性
            // setAttribute(属性名, 属性值)
            oImg.setAttribute("src","./img/logo.png");
            // 也可以通过点语法来设置属性
            // oImg.src = "./img/logo.png";

            // 获取属性的值
            // getAttribute(属性名)
            // var imgAlt = oImg.getAttribute("alt");
            // console.log(imgAlt);
            // 也可以通过点语法来获取属性
            var imgAlt = oImg.alt;
            console.log(imgAlt);


            // oBox.setAttribute("class","box box2");
        }

    </script>
</body>
</html>