Comprehensive examples of javascript image switching (cyclic switching, sequential switching)

Comprehensive examples of javascript image switching (cyclic switching, sequential switching)_javascript skills

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Release： 2016-05-16 15:19:58

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The example in this article introduces two methods of javascript image switching, the example code of cyclic switching and sequential switching, and is shared with you for your reference. The specific content is as follows

<html>
  <head>
    <meta charset="utf-8">
    <style>
    p{margin:0;}
    input{border:none;outline: none;margin:0;padding:0;}
     img{width:300px;height:300px;}
     #loop{margin-left:50px;background:#c80;width:60px;height:40px;font-size:14px;line-height:20px;text-align: center;}
     #order{margin-left:50px;background:#c80;width:60px;height:40px;font-size:14px;line-height:20px;text-align:center;}
     div{width:300px;height:300px;position:relative;}
     span{position:absolute;left:0;top:0;width:300px;height:20px;font-size:14px;line-height:20px;background:#000;opacity:0.5;color:#fff;text-align: center;}
     div p{position:absolute;left:0;bottom:0;width:300px;height:20px;font-size:14px;line-height:20px;text-align: center;color:#fff;background:#000;opacity:0.5;}
     div input{position:absolute;width:60px;height:60px;top:100px;background:pink;}
     #back{left:0;}
     #next{right:0;}
    </style>
    <script type="text/javascript">
     window.onload=function(){
      //循环切换
      var oNext=document.getElementById("next");
      var oBack=document.getElementById("back");
      var oImg=document.getElementById("img");
      var oText=document.getElementById("text");
      var oSpan=document.getElementById("span");
      var oLoop=document.getElementById("loop");
      var Oorder=document.getElementById('order');
      var oText1=document.getElementById("text1");
      var aImg=["img/1.jpg","img/2.jpg","img/3.jpg","img/4.jpg"];
      var aText=["图片1","图片2","图片3","图片4"];
 
      var num=0;
      //点击下一张事件
      function next(){
        num=num+1; //每次加一
        //进行判断，如果num大于最后一张时,图片返回第一张
        //// 1 2 3 4
        if(num>aImg.length-1){
           
          num=0;
        }
        oImg.src=aImg[num];
        oText.innerHTML=aText[num];//图片信息变化，与数组关联
        oSpan.innerHTML=(num+1)+"/"+aImg.length;//数量变化，与数组关联
        //alert(num);
       
      }
       function back(){
        num=num-1;
        //进行判断，如果图片小于第一张时,图片返回最后一张
        if(num<0){
          num=aImg.length-1;
        }
        oImg.src=aImg[num];
        oText.innerHTML=aText[num];//图片信息变化，与数组关联
        oSpan.innerHTML=(num+1)+"/"+aImg.length;//数量变化，与数组关联
      }
      function next1(){
        num=num+1; //每次加一
        //进行判断，如果num大于最后一张时,弹出警告并把图片定在最后一张
        //// 1 2 3 4
        if(num>aImg.length-1){
           
          num=aImg.length-1;
          alert("最后一张了");
        }
        oImg.src=aImg[num];
        oText.innerHTML=aText[num];
        oSpan.innerHTML=num+1+"/"+aImg.length;
        //alert(num);
        
      }
      function back1(){
        num=num-1;
        //进行判断，如果图片小于第一张时，弹出警告并把图片定在第一张
        if(num<0){
          num=0;
          alert("已经是第一张了");
        }
        oImg.src=aImg[num];
        oText.innerHTML=aText[num];
        oSpan.innerHTML=num+1+"/"+aImg.length;
      }
 
      oNext.onclick=next;
      oBack.onclick=back;
      oLoop.onclick=function(){
          oText1.innerHTML="图片可以从第一张到最后一张循环切换";
          oNext.onclick=next;
          oBack.onclick=back;
      }
      Oorder.onclick=function(){
         oText1.innerHTML="图片只能从第一张到最后一张顺序切换";
        oNext.onclick=next1;
        oBack.onclick=back1;
 
      }
 
 
     }
    
    </script>
  </head>
  <body>
    <input id="loop" type="button" name="" value="循环切换"/>
    <input id="order"type="button" name="" value="顺序切换"/>
    <p id="text1">图片可以从第一张到最后一张循环切换</p>
   <div>
    <input id="back" type="button" name="" value="上一张"/>
    <input id="next" type="button" name="" value="下一张"/>
     
      <img id="img" src="img/1.jpg"/>
      <span id="span">1/4</span>
      <p id="text">图片1</p>
   </div>
 
     
  </body>
</html>

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Picture switching means switching between two pictures in turn code:

<html lang="en">
  <head>
    <meta charset="utf-8">
    <style>
     #text{width:200px;height:200px;font-size:40px;line-height:40px;text-align: center;}
     img{width:200px;height:200px;}
    </style>
    <script type="text/javascript">
     window.onload=function(){
      var oBtn=document.getElementById("btn");
      var oImg=document.getElementById("img");
      var oText=document.getElementById("text");
      var onOff=true;
      oBtn.onclick=function(){
        if(onOff){
         oImg.src="img/7.jpg";
         oText.innerHTML="图片2";
         onOff=false;
        }
        else{
          oImg.src="img/5.jpg";
          oText.innerHTML="图片1";
          onOff=true;
        }
      }
 
    }
    </script>
  </head>
  <body>
    <input id="btn" type="button" name="" value="切换图片"/>
    <img id="img" src="img/5.jpg"/>
    <p id="text">图片1</p>
 
  </body>
</html>

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The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.