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Implementation of native js pull-down refresh and pull-up loading effects (code attached)

云罗郡主forward: 2018-10-11 15:35:575129browse

The content this article brings to you is about the implementation of native js pull-down refresh and pull-up loading effects (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

You can see the effect by switching to the mobile terminal in the console

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .header {
            position: fixed;
            left: 0;
            top: 0;
            width: 100%;
            height: 60px;
            background: pink;
            line-height: 60px;
            text-align: center;
            color: white;
        }
        .content {
            width: 200px;
            height: 1000px;
            border: 2px solid green;
            background: linear-gradient(#fff, #000);
            -webkit-flex-shrink: 0;
            flex-shrink: 0;
            margin: 60px auto 0;
        }
        img {
            width: 100%;
            height: 180px;
            position: absolute;
            top: 60px;
            left: 0;
            display: none;
            z-index: -1
        }
        p{
            line-height: 30px;
            text-align: center;
            display: none
        }
    </style>
</head>
<body>
    <div>
        <div>首页</div>
        <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536127130721&di=f192c5e1749dd2aa73b8a5b7297bd0cc&imgtype=0&src=http%3A%2F%2Fs10.sinaimg.cn%2Fmiddle%2F4ac1551583fc20f4db299%26690"
            alt="">
        <div></div>
        <p>加载中...</p>
    </div>
    <script>
        var oImg = document.getElementsByTagName(&#39;img&#39;)[0];
        var oP=document.getElementsByTagName(&#39;p&#39;)[0];
        var oHeader = document.getElementsByClassName(&#39;header&#39;)[0];
        var oContent = document.getElementsByClassName(&#39;content&#39;)[0];
        var screenH = document.documentElement.clientHeight || document.body.clientHeight;
        var startY,
            moveY;
        oContent.addEventListener(&#39;touchstart&#39;, (e) => {
            startY = e.touches[0].pageY;
        })
        oContent.addEventListener(&#39;touchmove&#39;, (e) => {
            moveY = e.touches[0].pageY - startY;
        });
        oContent.addEventListener(&#39;touchend&#39;, () => {
            if (moveY > 0) {//下拉
                oImg.style.display = &#39;block&#39;;
                if (moveY > 180) moveY = 180;
                oContent.style.marginTop = moveY + oHeader.clientHeight + &#39;px&#39;;
                //刷新数据后再走下面的
                var timer = setInterval(() => {
                    moveY -= 1;
                    if (moveY <= 0) {
                        oImg.style.display = &#39;none&#39;;
                        clearInterval(timer);
                        moveY = 0
                    }
                    oContent.style.marginTop = moveY + oHeader.clientHeight + &#39;px&#39;;
                }, 4)
            } else {//上拉
                var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
                if (scrollTop + screenH + 20 >= oContent.scrollHeight) {
                    oP.style.display=&#39;block&#39;
                    //加载下条数据
                    setTimeout(() => {
                        oP.style.display=&#39;none&#39;
                        oContent.style.height = oContent.clientHeight + 300 + &#39;px&#39;
                    }, 500)
                }
            }
        })
    </script>
</body>
</html>

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