在网站中实现预加载器

Question

我创建了这个 animation，我想将它用作预加载器。我可以使用由 html、css 和 js 构成的动画，还是应该创建 .gif 或简单的 css 动画？如果我可以使用它，我该如何在我的网站上实施它？我看过一些教程，其中大多数人创建 css 动画并将 class 调用到正文等，我的问题是另一回事。

var bar = $('span');
var p = $('.noumero');

var width = bar.attr('style');
width = width.replace("width:", "");
width = width.substr(0, width.length-1);

var interval;
var start = 0; 
var end = parseInt(width);
var current = start;

var countUp = function() {
  current++;
 p.html(current);

 if (current === end) {
  clearInterval(interval);
 }
 };

 interval = setInterval(countUp, (2000 / (end + 1)));

div.meter {
 position: relative;
 width: 400px;
 height: 4px;
 margin-top: 50px;
}

div.meter span {
 display: block;
 height: 100%;
 animation: grower 1.8s linear;
 -moz-animation: grower 1.8s linear;
 -webkit-animation: grower 1.8s linear;
 -o-animation: grower 1.8s linear;
 position: relative;
 top: -1px;
 left: -1px;
 background-color:rgba(255,0,0,1);
 -webkit-background-size: 45px 45px;
 -moz-background-size: 45px 45px;
 -o-background-size: 45px 45px;
 background-size: 45px 45px;
 }

.theR{
 float:left; 
 font-size:24px; 
 font-weight:bold;
 color:rgba(255,0,0,1);
 float:left; 
 display:block;
 margin-top:0px;
 font-family: 'Montserrat', sans-serif;
 }

.the255{
 float:left; 
 font-size:24px; 
 font-weight:bold;
 color:rgba(255,0,0,1); 
 float:left; 
 display:block; 
 margin-top:0px;
 font-family: 'Montserrat', sans-serif;
 }

.theline{
 width:255px; 
 float:left; 
 font-size:24px; 
 font-weight:bold; 
 color:red; 
 float:left; 
 display:block;
 }

@keyframes grower {
  0% {
    width: 0%;
   }
  }

@-moz-keyframes grower {
  0% {
    width: 0%;
  }
}

@-webkit-keyframes grower {
  0% {
    width: 0%;
 }
}

@-o-keyframes grower {
 0% {
   width: 0%;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="meter">
  <p class="theR">R</p>  
  <span style="width:255px;" class="theline"></span>
   <p class="noumero the255"></p>  
</div>
<div style="clear:both"></div>

Answer 1

对我来说，简单的方法是使用像 FontAwesome 中那样的微调器。但是如果你想将你的动画集成为预加载器，你需要调用另一个函数来检查你的加载状态，如果它正在改进，你调用 countup:

interval = setInterval(checkLoading, (2000 / (end + 1)));

在 checkLoading 中，您可以使用一个简单的数学方程式来准确了解您的进度：

function checkLoading(){
   var elementLoaded=countElements();
   var realState = (elementLoaded/allElementsToLoad)*end;
   while (realState<curent){
       countUp();
   }
}

Answer 2

可以在css处设置要显示的文档内容为display:none；使用 $.holdReady() 容纳 .ready() 个处理程序； .fadeToggle() 在动画完成时淡出 .meter 元素，并在 .meter 容器的 .fadeToggle() 完成后淡入文档内容

$.holdReady(true);

var bar = $('span');
var p = $('.noumero');

var width = bar.attr('style');
width = width.replace("width:", "");
width = width.substr(0, width.length - 1);

var interval;
var start = 0;
var end = parseInt(width);
var current = start;

var countUp = function() {
  current++;
  p.html(current);

  if (current === end) {
    clearInterval(interval);
    $(".meter").fadeToggle(500, function() {
      $.holdReady(false);
    })
  }
};

interval = setInterval(countUp, (2000 / (end + 1)));

$(document).ready(function() {
  $(".content").fadeToggle(5000)
})

div.meter {
  position: relative;
  width: 400px;
  height: 4px;
  margin-top: 50px;
}
div.meter span {
  display: block;
  height: 100%;
  animation: grower 1.8s linear;
  -moz-animation: grower 1.8s linear;
  -webkit-animation: grower 1.8s linear;
  -o-animation: grower 1.8s linear;
  position: relative;
  top: -1px;
  left: -1px;
  background-color: rgba(255, 0, 0, 1);
  -webkit-background-size: 45px 45px;
  -moz-background-size: 45px 45px;
  -o-background-size: 45px 45px;
  background-size: 45px 45px;
}
.theR {
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: rgba(255, 0, 0, 1);
  float: left;
  display: block;
  margin-top: 0px;
  font-family: 'Montserrat', sans-serif;
}
.the255 {
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: rgba(255, 0, 0, 1);
  float: left;
  display: block;
  margin-top: 0px;
  font-family: 'Montserrat', sans-serif;
}
.theline {
  width: 255px;
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: red;
  float: left;
  display: block;
}
@keyframes grower {
  0% {
    width: 0%;
  }
}
@-moz-keyframes grower {
  0% {
    width: 0%;
  }
}
@-webkit-keyframes grower {
  0% {
    width: 0%;
  }
}
@-o-keyframes grower {
  0% {
    width: 0%;
  }
}

.content {
  display:none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="meter">
  <p class="theR">R</p>
  <span style="width:255px;" class="theline"></span>
  <p class="noumero the255"></p>
</div>
<div style="clear:both"></div>
<div class="content">
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque ac tellus egestas, mattis arcu quis, tincidunt dui. Pellentesque pretium finibus sem, vitae egestas magna sollicitudin sed. Proin ac lectus eget magna porta molestie. Mauris enim tellus, iaculis eget lacus sit amet, varius fringilla augue. Vivamus aliquet lacinia ipsum eget aliquam. Sed et ex neque. Curabitur hendrerit faucibus dignissim. Sed id luctus nunc. Suspendisse ac enim at leo dictum fermentum. Phasellus congue quis nibh at aliquam. Fusce hendrerit dui vel eros tincidunt, id efficitur tellus auctor. Pellentesque et mi placerat eros consequat suscipit. Proin a placerat velit. Suspendisse quis laoreet metus. Integer tristique congue suscipit.

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</div>

在网站中实现预加载器

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html

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preloader