javascript - document.readyState === 'complete' Under what circumstances can it be executed normally?-PHP Chinese Network Q&A

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
*{ margin:0; padding:0;}
html{ font-size:15.625vw;}
html,body{ width:100%; height:100%;}
body{ font-size:0.30rem; font-family:"微软雅黑"; text-align:center; color:#fff;}
.main{ overflow:hidden;}
.main, .swiper-wrapper, .swiper-slide{ width:100%; height:100%;}
.item-01{ background-color:#f00;}
.item-02{ background-color:#ff0;}
.item-03{ background-color:#f0f;}
.item-04{ background-color:#0074db;}

.loading{ width:100%; height:100%;}
.circle{ position:absolute; left:50%; top:50%; margin-left:-1.00rem; margin-top:-1.00rem; width:2.00rem; height:2.00rem; border-radius:50%;}
.circle-01{ background-color:#fff; animation:scale 1s ease-in-out infinite;}
.circle-02{ background-color:#eee; animation:re-scale 1s ease-in-out infinite;}

@keyframes scale{
    0%{ transform:scale(1,1);}
    50%{ transform:scale(0,0);}
    100%{ transform:scale(1,1);}
    }
@keyframes re-scale{
    0%{ transform:scale(0,0);}
    50%{ transform:scale(1,1);}
    100%{ transform:scale(0,0);}
    }

</style>
</head>

<body>

<p class="main swiper-container">
  <p class="swiper-wrapper">
    <p class="swiper-slide item-01">
      <p class="loading">
        <span class="circle circle-01"></span>
        <span class="circle circle-02"></span>
      </p>
    </p>
    <p class="swiper-slide item-02">2</p>
    <p class="swiper-slide item-03">3</p>
    <p class="swiper-slide item-04">4</p>
  </p>
</p>


<script src="jquery-2.1.4.min.js"></script>
<script src="swiper.jquery.js"></script>
<script>

if(document.readyState === 'complete'){
    $('.loading').fadeOut(100);
    }

/*var timer = setTimeout(function (){
    $('.loading').fadeOut(100);
    
    clearTimeout(timer);
    timer = null;
    }, 3000);*/


mySwiper = new Swiper('.swiper-container', {
    direction:"vertical"
    });

</script>
</body>
</html>

The following code cannot be executed normally. What is the problem?

if(document.readyState === 'complete'){
    $('.loading').fadeOut(100);
    }

Php8, I'm coming too

Learn website layout in 30 minutes

Shangguan Oracle Beginner to Proficient Video Tutorial

Your first line of UNI-APP code

Flutter from scratch to app launch

Brother Lian New Linux Video Tutorial

AXURE 9 Video Tutorial (Suitable for Product Manager Interactive Product Design UI)

Zero Basic Proficiency PS Video Tutorial

16 day UI video tutorial to get you started

PS Techniques and Slicing Techniques Video Tutorial

Alibaba Cloud Environment Construction and Project Launch Video Tutorial

Overview of Computer Networks - Basic Knowledge that Programmers Must Master

Essential Tutorial for Programmers - HTTP Protocol Explanation

Websocket Video Tutorial