封装函数减少代码量 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="显示大图" id="btn" />
<img src="images/1.jpg" alt="" id="btn2">
<script>
    function my$(id){
        return document.getElementById(id);
    }

  // document.getElementById("btn").onclick=function() {
    //     document.getElementById("btn2").src = "images/2.jpg";
    // };
    my$("btn").onclick=function() {
        my$("btn2").src = "images/2.jpg";
    };
</script>
</body>
</html>
posted @ 2019-01-20 00:38  燕十三丶  阅读(172)  评论(0)  编辑  收藏  举报
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