js 上下切换图片

时间：2024-04-28 10:38:24
<html><head lang="en">

    <meta charset="UTF-8">

    <title></title>

</head>

<body>

   <img class="icon" src="img/icon_01.png">

   <p></p>

   <button class="btn1">上一张</button>

   <button class="btn2">下一张</button>

   <script>

       // 拿到所有的标签

       var img = document.getElementsByClassName('icon')[];

       var btn1 = document.getElementsByClassName('btn1')[];

       var btn2 = document.getElementsByClassName('btn2')[];

       // 业务处理

         var maxNumber = ;

         var minNumber = ;

///        //   当前的值

         var currentValue = minNumber;

      // 点上一张

        btn1.onclick = function(){

           if(currentValue == minNumber){

               currentValue = maxNumber;

           }else{

               currentValue = currentValue - ;

           }

            img.src = 'img/icon_0'+currentValue +'.png';

        }

      // 点下一张

        btn2.onclick = function(){

            if(currentValue == maxNumber ){

                currentValue = minNumber;

            }else{

                currentValue = currentValue + ;

            }

            console.log(currentValue);

            img.src = 'img/icon_0'+currentValue +'.png';

        }

   </script>

</body></html>

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