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Detailed example of JS implementation of paginated browsing of horizontal images

小云云Original: 2017-12-26 13:52:272095browse

This article mainly introduces the JS example code for implementing paging browsing of horizontal images (carousel-like). The code is simple and easy to understand, very good, and has reference value. Friends who need it can refer to it. I hope it can help everyone.

Yesterday, a friend asked me how to use js to realize the paging browsing of horizontal pictures. In fact, the implementation code is very simple. The editor below brings you the specific implementation code. The code is as follows:

common.js

function $(id) { 
 return document.getElementById(id); 
} 
function $_tag(tag) { 
 return document.getElementsByTagName(tag); 
}

index.html

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <title>Document</title> 
 <style> 
  a { 
   cursor: pointer; 
  } 
  .p1 { 
   width: 410px; /* 可以去掉 */ 
   height: 100px; 
   overflow-x: hidden; 
   white-space: nowrap; 
  } 
  .p2 { 
   display: none; 
  } 
 </style> 
</head> 
<body> 
 <p class="p1" id="p1"> 
 </p> 
 <a onclick="pre()">上一页</a> 
 <a onclick="next()">下一页</a> 
 <p class="p2"> 
  <img src="images/1.jpg" alt=""> 
  <img src="images/2.jpg" alt=""> 
  <img src="images/3.jpg" alt=""> 
  <img src="images/4.jpg" alt=""> 
  <img src="images/5.jpg" alt=""> 
  <img src="images/6.jpg" alt=""> 
  <img src="images/7.jpg" alt=""> 
 </p> 
 <script src="js/common.js"></script> 
 <script> 
  //搞一个拼img标签的函数 传参数 for循环 
  //扩展、稳定、兼容、好用(简单)... 
  //<img src="images/7.jpg" alt=""> 
  var count = 4; // 每页的图片数目 
  var currentpage = 1; //当前页数 
  var imgs = $_tag("img"); 
  //console.log(imgs); 可以深入了解下 
  console.log("图片总数：" + imgs.length); 
  var totalpage = Math.ceil(imgs.length/count); 
  console.log("总页数：" + totalpage); 
  function pre() { 
   if(currentpage == 1){ 
    console.log("已经是第一页了!"); 
    return; 
   }else if(currentpage > 1){ 
    var tmp = (currentpage - 2) * count + 1; 
    var str = ""; 
    str += "<img src=&#39;" + "images/" + tmp + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+1) + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+2) + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+3) + ".jpg&#39;>"; 
    currentpage -= 1; 
    console.log(str); 
    $("p1").innerHTML = str; 
   } 
  } 
  function next() { 
   if(currentpage == totalpage){ 
    console.log("已经是最后一页了!"); 
   }else if(currentpage == (totalpage - 1)){ 
    var sur = imgs.length % count; 
    var tmp1 = currentpage * count + 1; 
    var str = ""; 
    console.log("剩余数:" + sur); 
    for(var i=0;i<sur;i++){ 
     console.log("第几张：" + (tmp1+i)); 
     str += "<img src=\"" + "images/" + (tmp1+i) + ".jpg\">"; 
    } 
    currentpage += 1; 
    console.log(str); 
    $("p1").innerHTML = str; 
   }else if(currentpage > 0){ 
    var tmp = currentpage * count + 1; 
    console.log("tmp:" + tmp); 
    var str = ""; 
    str += "<img src=&#39;" + "images/" + tmp + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+1) + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+2) + ".jpg&#39;>"; 
    str += "<img src=&#39;" + "images/" + (tmp+3) + ".jpg&#39;>"; 
    currentpage += 1; 
    $("p1").innerHTML = str; 
   } 
  } 
  function firstpage() { 
   var str = ""; 
   str += "<img src=&#39;" + "images/" + 1 + ".jpg&#39;>"; 
   str += "<img src=&#39;" + "images/" + 2 + ".jpg&#39;>"; 
   str += "<img src=&#39;" + "images/" + 3 + ".jpg&#39;>"; 
   str += "<img src=&#39;" + "images/" + 4 + ".jpg&#39;>"; 
   console.log(str); 
   $("p1").innerHTML = str; 
  } 
  window.onload = function() { 
   firstpage(); 
  } 
 </script> 
</body> 
</html>

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