<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <style> #wai{ margin: 50px auto; border:1px solid; width: 200px; height: 300px; background-color: aqua; padding:10px; text-align:center; } </style> </head> <body> <div id="wai"> <p></p> <img src="拼图效果/01.jpg" alt="1"> <button id="prev">上一张</button> <button id="next">下一张</button> </div> <script> var prev=document.getElementById("prev"); var next=document.getElementById("next"); var img=document.getElementsByTagName("img")[0]; var arr=["拼图效果/01.jpg","拼图效果/02.jpg","拼图效果/03.jpg","拼图效果/04.jpg","拼图效果/05.jpg","拼图效果/06.jpg"]; var index=0; var p=document.getElementsByTagName("p")[0]; p.innerHTML="一共"+(arr.length-1)+"张,这是第"+(index+1)+"张" prev.onclick=function(){ index--; if(index<0){ index=arr.length-1; } img.src=arr[index]; p.innerHTML="一共"+(arr.length-1)+"张,这是第"+(index+1)+"张" }; next.onclick=function(){ index++; if(index>arr.length-1){ index=0; } img.src=arr[index]; p.innerHTML="一共"+(arr.length-1)+"张,这是第"+(index+1)+"张" }; </script> </body> </html>