如何防止我的一个视差元素移位？

该脚本功能的视差效果，但一旦页面滚动'徽标'div立即跳转到左侧，我不知道如何解决这个问题。如果可能的话，我想知道是什么导致了冲突。如何防止我的一个视差元素移位？

*脚本写在html的底部。当您滚动

html { 
 
overflow: 
 
} 
 

 
body { 
 
    overflow-y: auto; 
 
    overflow-x: hidden; 
 
    height: 100vh; 
 
    margin: 0; /* remove default margin */ 
 
} 
 

 
div#container{ 
 
    height: 100%; 
 
    margin: 0; 
 
} 
 

 
div#static_nav { 
 
    width: 100%; 
 
    height: 2em; 
 
    padding-top: 10px; 
 
    position: fixed; 
 
    z-index: 999; 
 
} 
 

 
.static_nav_full { 
 
    background-color: #3A3D3F; 
 
    transition: background-color 2s; 
 
    opacity: .90; 
 
} 
 

 
.navbar{ 
 
    font-family: 'Source Sans Pro', sans-serif; 
 
    padding-right: 20px; 
 
    background-color: transparent; 
 
    text-align: right; 
 

 
} 
 

 
div#static_nav a{ 
 
    color: white; 
 
    text-decoration: none; 
 
    padding-right: 20px; 
 
} 
 

 
div#block_one, div#block_two, div#block_three, 
 
div#block_four{ 
 
    height: 100vh; 
 
    z-index: 1; 
 
} 
 

 
div#block_one{ 
 
    background-image: url(https://images5.alphacoders.com/439/thumb-1920-439361.jpg); 
 
    background-size: cover; 
 
    background-attachment: fixed; 
 
    transition: all 0.2s ease; 
 

 
} 
 

 
div#logo{ 
 
    background-image: url(https://cdn.pixabay.com/photo/2016/06/13/16/35/indian-1454621_1280.png); 
 
    background-size: contain; 
 
    background-position: center; 
 
    background-repeat: no-repeat; 
 
    background-attachment: fixed; 
 
    height: 100%; 
 
} 
 

 
div#block_five{ 
 
    height: 30vh; 
 
    background-color: #F5F5F5; 
 
}

<!DOCTYPE html> 
 

 
<html lang = "en"> 
 
<meta charset = "utf-8" /> 
 

 
<head> 
 
    <link rel = "stylesheet" type = "text/css" href = "tof_css.css" /> 
 
    <script src ="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
 

 
    <link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Lato|Kanit|Heebo|Source+Sans+Pro:200"> 
 

 
    <script src="finaljs.js"></script> 
 
    <script src="smthscrll.js"></script> 
 
</head> 
 

 
<body> 
 
    <div id = "container"> 
 

 
    <header> 
 
     <div id = "static_nav"> 
 
     <nav class = "navbar"> 
 
      <a href = "#block_one">Home</a> 
 
      <a href = "#block_two">About</a> 
 
      <a href = "#block_four">People</a> 
 
      <a href = "#block_five">Contact</a> 
 
      <a href = "">Log In</a> 
 
     </nav> 
 
     </div> 
 
    </header> 
 

 

 
    <div id = "block_one"> 
 
    <div id = "logo"> 
 
    </div> 
 
    </div> 
 

 
    <div id = "block_two"> 
 
    </div> 
 

 
    <div id = "block_three"> 
 
    </div> 
 

 
    <div id = "block_four"> 
 
    </div> 
 

 
    <div id = "block_five"> 
 
    </div> 
 

 
</div> 
 

 
<script type="text/javascript"> 
 

 
     (function() { 
 

 
      var documentEl = $(document), 
 
       blockone = $('#block_one'); 
 
       logo = $('#logo'); 
 

 
      documentEl.on('scroll', function() { 
 
       var currScrollPos = documentEl.scrollTop(); 
 
       blockone.css('background-position', '0 ' + -currScrollPos/4 + 'px'); 
 
       logo.css('background-position', '0 ' + -currScrollPos/2 + 'px'); 
 
      }); 
 

 
      })(); 
 
     </script> 
 
</body> 
 
</html>

来源

2016-12-26 gwiz_kid

它跳转，因为你操纵位置。（左侧设置为0，与滚动相关的顶部）。 –

正如上面的评论所述。它“跳跃”，因为你让它跳跃。你操纵背景位置（左值）为0，则应该操纵它喜欢的东西：

function setPosition() { 
    var currScrollPos = documentEl.scrollTop(); 
    blockone.css('background-position', '0 ' + -currScrollPos/4 + 'px'); 
    logo.css('background-position', 'center ' + -currScrollPos/2 + 'px') 
}

我已经更新了example。

来源

2016-12-26 20:34:26

哦，我知道标志应该在左边哈哈，我正确:) –

@Citizen我相信他的CSS值是“正确的”，他想知道为什么它跳到左边。 –

是的，我纠正了，thx;） –

Scroll事件才会被调用，所以先请页面初始化定位功能，那么你的问题就解决了：

(function() { 

var documentEl = $(document), 
    blockone = $('#block_one'); 
    logo = $('#logo'); 

setPosition(); 

documentEl.on('scroll', function() { 
    setPosition(); 
}); 

function setPosition() { 
    var currScrollPos = documentEl.scrollTop(); 
    blockone.css('background-position', '0 ' + -currScrollPos/4 + 'px'); 
     logo.css('background-position', 'center ' + -currScrollPos/2 + 'px'); 
    } 

})();

这里的example

来源

2016-12-26 20:26:56

谢谢你的帮助和解释！我知道这很简单，但我看不到它。再次感谢！ –

如何防止我的一个视差元素移位？

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