页面预加载loading动画，再载入内容

时间 2020-08-18 标签页面加载 loading 动画载入内容

默认状况下若是网站请求速度慢，因此会有一段时间的空白页面等等，用户体验效果很差，见到不少的页面都有预加载的效果，加载以前先加载一个动画，后台进程继续加载页面内容，当页面内容加载完以后再退出动画显示内容，这样的用户体验更好。javascript

例如此连接：http://crusader12.com/C12HoverAlls/ css

这篇文章是从上面连接的内容上拔下来的，操做流程很简单，只有两部以下html

首先定义一个loader.css文件，以下内容java

.chromeframe { margin: 0.2em 0; background: #ccc; color: #000; padding: 0.2em 0;}
#loader-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index:999999;}
#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; /* COLOR 1 */ border-top-color: #FFF; -webkit-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -ms-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -moz-animation: spin 2s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -o-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; /* COLOR 2 */ border-top-color: #FFF; -webkit-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -moz-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -o-animation: spin 3s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -ms-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: #FFF; /* COLOR 3 */ -moz-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -o-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -ms-animation: spin 1.5s linear infinite; /* Chrome, Opera 15+, Safari 5+ */ -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: #1abc9c; /* Old browsers */ 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;}
#loader-wrapper .load_title { font-family:'Open Sans'; color:#FFF; font-size:19px; width:100%; text-align:center; z-index:9999999999999; position:absolute; top:60%; opacity:1; line-height:30px; }
#loader-wrapper .load_title span { font-weight:normal; font-style:italic; font-size:13px; color:#FFF; opacity:0.5;}

第二步：在网站页面header标签和body标签加入如下代码jquery

// 引入jquery 

<!--页面加载start-->
<link rel="stylesheet" type="text/css" href="css/loader.min.css">

<script type="text/javascript"> // 等待全部加载 $(window).load(function(){ $('body').addClass('loaded'); $('#loader-wrapper .load_title').remove(); }); </script>    

<div id="loader-wrapper">
    <div id="loader"></div>
    <div class="loader-section section-left"></div>
    <div class="loader-section section-right"></div>
    <div class="load_title">正在加载LoveFeel站点<br><span>V1.0</span></div>
</div>
<!--页面加载end-->

HoverAlls页面源码以下操做，他先是加载一段json封装以后再显示内容的，我上面的代码省去了json的操做。web

$(window).load(function(){
    $('body').addClass('loaded').Chameleon({
        'current_item':'hoveralls',
        'json_url':'../Envato/items.json'
    });
    $('#loader-wrapper .load_title').remove();
});

固然也能够访问个人页面看看效果
http://lovefeel.top/marry/ chrome

查看原文：http://www.ibloger.net/article/401.htmljson

页面预加载loading动画，再载入内容

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