搜索

首页  >  问答  >  正文

css - 移动端布局,Safari中absolute定位抖动?

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">
    <title>layout</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        html, body, .page-container {
            height: 100%;
        }

        .page-container {
            position: relative;
            overflow: hidden;
        }

        .page-header {
            position: absolute;
            top: 0;
            width: 100%;
            height: 40px;
            border-bottom: 1px solid red;
        }

        .page-wrapper {
            margin-top: 40px;
            overflow-y: scroll;
            -webkit-overflow-scrolling: touch;

        }

        .page-footer {
            position: absolute;
            bottom: 0;
            width: 100%;
            height: 40px;
            border-top: 1px solid black;
        }

        .submenu {
            background: #000;
            width: 100%;
            height: 20px;
            z-index: 5555;
            -webkit-transform: translateZ(0);
            -moz-transform: translateZ(0);
            -ms-transform: translateZ(0);
            -o-transform: translateZ(0);
            transform: translateZ(0);
        }
    </style>
</head>
<body>
<p class="page-container">
    <p class="page-header"></p>
    <p class="page-wrapper">
        <p style="height: 400px;"></p>
        <p class="submenu-container">
            <p class="submenu"></p>
        </p>
        <p style="height: 1000px;"></p>
    </p>
    <p class="page-footer"></p>
</p>
<script src="http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
<script>
    $(function () {
        var $el = $('.page-wrapper');
        $el.height($(window).height() - 80);
        $el[0].addEventListener('touchmove', fixedIt, false);
        $el[0].addEventListener('scroll', fixedIt, false);
    });

    function fixedIt() {
        var offsetTop = $('.submenu-container').offset().top;
        if (offsetTop <= 40) {
            $('.submenu').css({position: 'absolute', top: '40px'});
        } else {
            $('.submenu').css({position: 'static'});
        }
    }
</script>
</body>
</html>

在Safari中继续滑动,固定的元素会抖动,求解?

PHPzPHPz2782 天前993

全部回复(1)我来回复

  • 高洛峰

    高洛峰2017-04-17 14:54:11

    1. 直接写css值这种性能消耗太大了,可以的话尽量用jq的addClassremoveClasstoggleClass来写;

    2. scroll这种高频事件,要加函数/事件防抖来写,避免单位时间内高频反复调用带来的性能损失;

    3. 事件监听写jq的就好了啊,一个on能省多少字符啊……

    回复
    0
  • 取消回复