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簡單實現js間歇或無縫滾動效果
編輯:關於JavaScript     

間歇、無縫滾動效果(用gif錄制的效果不是很好,有興趣的可以down代碼),具體內容如下

代碼:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>無縫滾動</title>
 <style>
  *{margin:0;padding:0;}
  .box{width: 500px;height: 400px;margin:40px auto;background: #ccc;overflow: hidden;}
  .block{position: relative;width: 500px;height: 400px;overflow: hidden;}
  .item{height: 40px;background: red;color: #fff;line-height: 40px;text-align: center;}
  .item:nth-child(2n){background: #000}
 </style>
 <script>
  var scrollUp=(function(){
   return function(json){
    var objScroll = document.getElementById(json.id);
    objScroll.scrollTop = 0;
    objScroll.innerHTML += objScroll.innerHTML;
    if(json.on){
     function scrollIng(){
      if(objScroll.scrollTop >= objScroll.scrollHeight) {
       objScroll.scrollTop = 0;
      }else{
       objScroll.scrollTop ++; 
      } 
     }
     var myScroll = setInterval(function(){scrollIng()},30);
     objScroll.onmouseover = function(){
      clearInterval(myScroll);
     }
     objScroll.onmouseout = function(){
      myScroll = setInterval(function(){scrollIng()},30);
     }
    }else{
     var timer;
     function startScroll(){
      timer=setInterval(function(){scrollUp()},30);
      objScroll.scrollTop++;
     }
     function scrollUp(){
      if(objScroll.scrollTop % json.height==0){
       clearInterval(timer);
       setTimeout(startScroll,2000);
      }else{
       objScroll.scrollTop++;
       if(objScroll.scrollTop >= objScroll.scrollHeight/2){
        objScroll.scrollTop =0;
       }
      }
     }
     setTimeout(startScroll,1000);
    }
   }
  })()
  window.onload=function(){
   //on:間歇滾動/無縫滾動 height:間歇滾動的高度
   scrollUp({on:true,id:'block'});
   scrollUp({id:'block2',height:120});
  }
  
 </script>
</head>
<body>
 <div class="box">
  <div class="block" id="block">
   <div class="item">1無縫滾動</div>
   <div class="item">2無縫滾動</div>
   <div class="item">3無縫滾動</div>
   <div class="item">4無縫滾動</div>
   <div class="item">5無縫滾動</div>
   <div class="item">6無縫滾動</div>
   <div class="item">7無縫滾動</div>
   <div class="item">8無縫滾動</div>
   <div class="item">9無縫滾動</div>
   <div class="item">10無縫滾動</div>
   <div class="item">11無縫滾動</div>
   <div class="item">12無縫滾動</div>
   <div class="item">13無縫滾動</div>
   <div class="item">14無縫滾動</div>
   <div class="item">15無縫滾動</div>
  </div>
 </div>
 <div class="box">
  <div class="block" id="block2">
   <div class="item">1間歇滾動</div>
   <div class="item">2間歇滾動</div>
   <div class="item">3間歇滾動</div>
   <div class="item">4間歇滾動</div>
   <div class="item">5間歇滾動</div>
   <div class="item">6間歇滾動</div>
   <div class="item">7間歇滾動</div>
   <div class="item">8間歇滾動</div>
   <div class="item">9間歇滾動</div>
   <div class="item">10間歇滾動</div>
   <div class="item">11間歇滾動</div>
   <div class="item">12間歇滾動</div>
   <div class="item">13間歇滾動</div>
   <div class="item">14間歇滾動</div>
   <div class="item">15間歇滾動</div>
  </div>
 </div>
</body>
</html> 

注意點:
1.盒子塊要css 溢出隱藏:overflow:hidden
2.有兩個功能:間歇滾動/無縫滾動
3.先復制一塊一模一樣的代碼,無縫滾動:執行定時器一直增加scrollTop值,當scrollTop值大於盒子高度,在設置scrollTop為0,重新來過。間歇滾動在此基礎上加了setTimeout,間歇執行,在scrollTop到達指定的height停止
4.疑問:代碼中setInterval(function(){scrollIng()},30);這樣寫才可以執行,setInterval('scrollIng()',30);這樣就不行,有沒有大神指導下,兩者有啥區別?是啥機制?

以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持。

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