CSS Preloader不會轉換為文本

Question

我遵循了本教程，並設法創建了一個CSS預加載器。

但是，預加載器無法正常工作。 它顯示了加載程序，這些位工作正常，但不會過渡到文本位。 我不知道我做錯了什么。 我遵循了該教程，甚至通過CSS / JS代碼將其復制到了自己的腳本中，以確認它不起作用。 它仍然行不通。

您可以看一下代碼，請告訴我我做錯了什么？ 謝謝

PS：所有這些文件都位於同一目錄中。

 $(document).ready(function() { setTimeout(function() { $('body').addClass('loaded'); $('h1').css('color', '#222222'); }, 3000); }); 

 p { line-height: 1.33em; color: #7E7E7E; } h1 { color: #EEEEEE; } #loader-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1000; } #loader { display: block; position: relative; left: 50%; top: 50%; width: 150px; height: 150px; margin: -75px 0 0 -75px; border-radius: 50%; border: 3px solid transparent; border-top-color: #3498db; -webkit-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 2s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ z-index: 1001; } #loader:before { content: ""; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; border: 3px solid transparent; border-top-color: #e74c3c; -webkit-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 3s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } #loader:after { content: ""; position: absolute; top: 15px; left: 15px; right: 15px; bottom: 15px; border-radius: 50%; border: 3px solid transparent; border-top-color: #f9c922; -webkit-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 1.5s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } @-webkit-keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } @keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } #loader-wrapper .loader-section { position: fixed; top: 0; width: 51%; height: 100%; background: #222222; z-index: 1000; -webkit-transform: translateX(0); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(0); /* IE 9 */ transform: translateX(0); /* Firefox 16+, IE 10+, Opera */ } #loader-wrapper .loader-section.section-left { left: 0; } #loader-wrapper .loader-section.section-right { right: 0; } /* Loaded */ .loaded #loader-wrapper .loader-section.section-left { -webkit-transform: translateX(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(-100%); /* IE 9 */ transform: translateX(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader-wrapper .loader-section.section-right { -webkit-transform: translateX(100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(100%); /* IE 9 */ transform: translateX(100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader { opacity: 0; -webkit-transition: all 0.3s ease-out; transition: all 0.3s ease-out; } .loaded #loader-wrapper { visibility: hidden; -webkit-transform: translateY(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateY(-100%); /* IE 9 */ transform: translateY(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.3s 1s ease-out; transition: all 0.3s 1s ease-out; } /* JavaScript Turned Off */ .no-js #loader-wrapper { display: none; } .no-js h1 { color: #222222; } #content { margin: 0 auto; padding-bottom: 50px; width: 80%; max-width: 978px; } 

 <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="./preloader.css"> </head> <body> <div id="loader-wrapper"> <div id="loader"></div> <div class="loader-section section-left"></div> <div class="loader-section section-right"></div> <div id="content"> <h2>This is our page title</h2> <p>Lorem ipsum dolor sit amet.</p> </div> </div> <script src="./preloader.js"></script> </body> </html> 

Answer 1

包含jQuery之后

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js">

以上

<script src="./preloader.js"></script>

您可以閱讀About jQuery ，為什么需要jQuery以及jQuery腳本如何工作，因此您可以自己調試這些小問題

工作示例（無需更改其他任何內容）

 $(document).ready(function() { setTimeout(function() { $('body').addClass('loaded'); $('h1').css('color', '#222222'); }, 3000); }); 

 p { line-height: 1.33em; color: #7E7E7E; } h1 { color: #EEEEEE; } #loader-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1000; } #loader { display: block; position: relative; left: 50%; top: 50%; width: 150px; height: 150px; margin: -75px 0 0 -75px; border-radius: 50%; border: 3px solid transparent; border-top-color: #3498db; -webkit-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 2s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ z-index: 1001; } #loader:before { content: ""; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; border: 3px solid transparent; border-top-color: #e74c3c; -webkit-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 3s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } #loader:after { content: ""; position: absolute; top: 15px; left: 15px; right: 15px; bottom: 15px; border-radius: 50%; border: 3px solid transparent; border-top-color: #f9c922; -webkit-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 1.5s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } @-webkit-keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } @keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } #loader-wrapper .loader-section { position: fixed; top: 0; width: 51%; height: 100%; background: #222222; z-index: 1000; -webkit-transform: translateX(0); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(0); /* IE 9 */ transform: translateX(0); /* Firefox 16+, IE 10+, Opera */ } #loader-wrapper .loader-section.section-left { left: 0; } #loader-wrapper .loader-section.section-right { right: 0; } /* Loaded */ .loaded #loader-wrapper .loader-section.section-left { -webkit-transform: translateX(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(-100%); /* IE 9 */ transform: translateX(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader-wrapper .loader-section.section-right { -webkit-transform: translateX(100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(100%); /* IE 9 */ transform: translateX(100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader { opacity: 0; -webkit-transition: all 0.3s ease-out; transition: all 0.3s ease-out; } .loaded #loader-wrapper { visibility: hidden; -webkit-transform: translateY(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateY(-100%); /* IE 9 */ transform: translateY(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.3s 1s ease-out; transition: all 0.3s 1s ease-out; } /* JavaScript Turned Off */ .no-js #loader-wrapper { display: none; } .no-js h1 { color: #222222; } #content { margin: 0 auto; padding-bottom: 50px; width: 80%; max-width: 978px; } 

 <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="./preloader.css"> </head> <body> <div id="loader-wrapper"> <div id="loader"></div> <div class="loader-section section-left"></div> <div class="loader-section section-right"></div> <div id="content"> <h2>This is our page title</h2> <p>Lorem ipsum dolor sit amet.</p> </div> </div> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <script src="./preloader.js"></script> </body> </html> 

Answer 2

事情是在您的js中，您正在使用$ 、. .addClass ， .css等jquery的選擇器和方法，並且要使用它，您必須包括jQuery

https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js

看看這個http://www.w3schools.com/jquery/jquery_selectors.asp

或者您也可以使用純JavaScript來做到這一點：

 document.addEventListener("DOMContentLoaded", function(event) { setTimeout(function() { document.querySelector("body").className = "loaded"; document.querySelector("h1").style.color = "#222222"; }, 3000); }); 

 p { line-height: 1.33em; color: #7E7E7E; } h1 { color: #EEEEEE; } #loader-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1000; } #loader { display: block; position: relative; left: 50%; top: 50%; width: 150px; height: 150px; margin: -75px 0 0 -75px; border-radius: 50%; border: 3px solid transparent; border-top-color: #3498db; -webkit-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 2s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ z-index: 1001; } #loader:before { content: ""; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; border: 3px solid transparent; border-top-color: #e74c3c; -webkit-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 3s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } #loader:after { content: ""; position: absolute; top: 15px; left: 15px; right: 15px; bottom: 15px; border-radius: 50%; border: 3px solid transparent; border-top-color: #f9c922; -webkit-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ animation: spin 1.5s linear infinite; /* Chrome, Firefox 16+, IE 10+, Opera */ } @-webkit-keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } @keyframes spin { 0% { -webkit-transform: rotate(0deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(0deg); /* IE 9 */ transform: rotate(0deg); /* Firefox 16+, IE 10+, Opera */ } 100% { -webkit-transform: rotate(360deg); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: rotate(360deg); /* IE 9 */ transform: rotate(360deg); /* Firefox 16+, IE 10+, Opera */ } } #loader-wrapper .loader-section { position: fixed; top: 0; width: 51%; height: 100%; background: #222222; z-index: 1000; -webkit-transform: translateX(0); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(0); /* IE 9 */ transform: translateX(0); /* Firefox 16+, IE 10+, Opera */ } #loader-wrapper .loader-section.section-left { left: 0; } #loader-wrapper .loader-section.section-right { right: 0; } /* Loaded */ .loaded #loader-wrapper .loader-section.section-left { -webkit-transform: translateX(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(-100%); /* IE 9 */ transform: translateX(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader-wrapper .loader-section.section-right { -webkit-transform: translateX(100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateX(100%); /* IE 9 */ transform: translateX(100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1.000); } .loaded #loader { opacity: 0; -webkit-transition: all 0.3s ease-out; transition: all 0.3s ease-out; } .loaded #loader-wrapper { visibility: hidden; -webkit-transform: translateY(-100%); /* Chrome, Opera 15+, Safari 3.1+ */ -ms-transform: translateY(-100%); /* IE 9 */ transform: translateY(-100%); /* Firefox 16+, IE 10+, Opera */ -webkit-transition: all 0.3s 1s ease-out; transition: all 0.3s 1s ease-out; } /* JavaScript Turned Off */ .no-js #loader-wrapper { display: none; } .no-js h1 { color: #222222; } #content { margin: 0 auto; padding-bottom: 50px; width: 80%; max-width: 978px; } 

 <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="./preloader.css"> </head> <body> <div id="loader-wrapper"> <div id="loader"></div> <div class="loader-section section-left"></div> <div class="loader-section section-right"></div> <div id="content"> <h2>This is our page title</h2> <p>Lorem ipsum dolor sit amet.</p> </div> </div> <script src="./preloader.js"></script> </body> </html> 

我真的建議您添加jquery並避免您必須使用純JavaScript來做所有事情。