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HTML 

              
                <body>
    <div class="wrap">
        <div class="nav">
            <div class="header">
                <div class="title">
                    <h1>第十二屆鐵人賽</h1>
                </div>
                <ul class="menu">
                    <li><a href="#">首頁</a></li>
                    <li><a href="#frontEnd">三隻箭</a></li>
                    <li><a href="#data">累績數據</a></li>
                </ul>    
            </div>
        </div>
        <div class="pics">
            <h2>第十二屆鐵人賽</h2>
                <div class="logo">
                <img src="https://www.flaticon.com/svg/static/icons/svg/2693/2693110.svg" alt="鐵人">
            </div>
        </div>
        <div class="threePoint" id="frontEnd">
            <div class="content">
                <h2>前端三隻箭</h2>
                <div class="frontEnd">
                    <img src="https://www.flaticon.com/svg/static/icons/svg/919/919827.svg" alt="html">
                    <img src="https://www.flaticon.com/svg/static/icons/svg/919/919826.svg" alt="css">
                    <img src="https://www.flaticon.com/svg/static/icons/svg/919/919828.svg" alt="js">
                </div>     
            </div>
        </div>
        <div class="container">
            <div class="data" id="data">
                <div class="me">
                    <img src="https://www.flaticon.com/svg/static/icons/svg/2945/2945506.svg" alt="我">
                </div>
                <ul class="skill">
                    <li>
                        <p>HTML</p>
                        <div class="loading">
                            <div>5篇</div>
                        </div>
                    </li>
                    <li>
                        <p>CSS</p>
                        <div class="loading">
                            <div>5篇</div>
                        </div>
                    </li>
                    <li>
                        <p>jQuery</p>
                        <div class="loading">
                            <div>5篇</div>
                        </div>
                    </li>
                    <li>
                        <p>JavaScript</p>
                        <div class="loading">
                            <div>10篇</div>
                        </div>
                    </li>
                    <li>
                        <p>RWD</p>
                        <div class="loading">
                            <div>5篇</div>
                        </div>
                    </li>
                    <li>
                        <p>綜合練習</p>
                        <div class="loading">
                            <div>3篇</div>
                        </div>
                    </li>
                    <li>
                        <p>總天數</p>
                        <div class="loading">
                            <div>28天</div>
                        </div>
                    </li>
                </ul>
            </div>
        </div>
        <div class="icon">Icons made by <a href="https://www.flaticon.com/authors/freepik" title="Freepik">Freepik</a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com</a></div>
    </div>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
!

CSS 

              
                img{
    max-width: 100%;
    height: auto;
}
*,*::before,*::after{
    box-sizing: border-box;
}
.wrap{
    width: 100%;
    height: auto;
    font-family: 微軟正黑體;
    background-image: url(https://cdn.pixabay.com/photo/2020/05/19/12/04/work-5190435_1280.jpg);
    background-position: left bottom;
    background-size: cover;
    background-attachment: fixed;
    font-weight: bold;
}
.nav{
    width: 100%;
    background-color: #7d807e;
    position: fixed;
}
.nav .header{
    max-width: 960px;
    height: 44px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    color: #f8f8f1;
}
.nav .header .title{
    font-size: 20px;
    line-height: 44px;
}
.nav .header .menu{
    display: flex;
}
.nav .header .menu li a{
    display: block;
    text-decoration: none;
    text-align: center;
    padding: 14px 15px;
    color: #f8f8f1;
}
.nav .header .menu li a:hover{
    background-color: #f39356;
}
.pics{
    width: 600px;
    margin: 0px auto;
    padding-top: 124px;
}
.pics h2,.threePoint h2{
    color: #ffffff;
    text-align: center;
    font-size: 24px;
    line-height: 40px;
    padding: 10px;
    margin: 80px 0 20px;
}
.pics .logo img{
    display: block;
    width: 27%;
    height: auto;
    margin: 0 auto;
}
.threePoint{
    width: 100%;
    background-color:rgba(255, 191, 116,.8);
}
.threePoint h2{
    color: #000000;
    padding:80px 0 20px;
}
.threePoint .frontEnd{
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    padding-bottom: 80px;
}
.data{
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    padding: 70px 0;
}
.data .me{
    width: 30%;
}
.data .skill{
    width: 68%;
    color: #ffffff;
}
.data .me img{
    padding: 40px;
}
.data .skill li p{
    font-size: 20px;
    padding: 10px;
}
.data .skill li .loading{
    max-width: 600px;
    height: 30px;
    border-radius: 7px;
    background-color: #d3d3d3;
}
.data .skill li .loading div{
    width: 0%;
    overflow: hidden;
    text-align: center;
    line-height: 30px;
    border-radius: 7px;
    background-color: #ef8354;
    transition: all 1s .3s ease;
}
.data .skill .html .loading div{
    width: 30%;
}
.data .skill .css .loading div{
    width: 30%;
}
.data .skill .jquery .loading div{
    width: 30%;
}
.data .skill .js .loading div{
    width: 60%;
}
.data .skill .rwd .loading div{
    width: 30%;
}
.data .skill .total .loading div{
    width: 12%;
}
.data .skill .day .loading div{
    width: 90%;
}
!

JS 

              
                var lis = document.querySelectorAll(".data .skill li");
var classNames = ["html","css","jquery","js","rwd","total","day"];
var len = lis.length;

window.addEventListener("scroll",function(){
    var y = window.scrollY;
    console.log(y);
    if(y>500){
        for(var i=0;i<len;i++){
            lis[i].className = classNames[i];
        }     
    }
},false)


$(".nav .header .menu li a").click(function (e) { 
    e.preventDefault();
    var target =  $(this).attr("href");
    switch(target){
            case "#":
                $("html,body").animate({
                    scrollTop:0
                  },800);
                break;
            case "#frontEnd":
                $("html,body").animate({
                    scrollTop:484
                  },800);
                break;
            default:
                $("html,body").animate({
                    scrollTop:810
                  },800);
                break;
            }
});
!
999px

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