實例詳解JS實作分頁瀏覽橫向圖片-js教程-PHP中文網

實例詳解JS實作分頁瀏覽橫向圖片

小云云

發布： 2017-12-26 13:52:27

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2131 人瀏覽過

本文主要介紹了JS實作分頁瀏覽橫向圖片(類輪播)實例程式碼,程式碼簡單易懂，非常不錯，具有參考借鑒價值，需要的朋友可以參考下，希望能幫助到大家。

昨天朋友問我怎麼用js實作分頁瀏覽橫向圖片功能，其實實作程式碼很簡單的，下面小編給大家帶來了具體實作程式碼，程式碼如下圖：

#common.js

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

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##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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