在网页中添加 “返回顶部”按钮

1.首先在body中添加“返回顶部”按钮

<body>
    <div class="go-top">
        <div class="arrow"></div>
        <div class="stick"></div>
    </div>
</body>

2.css 的定义

div .go-top {
    display: none;
    opacity: 0.6;
    z-index: 999999;
    position: fixed;
    bottom: 113px;
    left: 90%;
    margin-left: 40px;
    border: 1px solid #a38a54;
    width: 38px;
    height: 38px;
    background-color: #eddec2;
    border-radius: 3px;
    cursor: pointer;
}

div .go-top:hover {
    opacity: 1;
    filter: alpha(opacity=100);
}

div .go-top div .arrow {
    position: absolute;
    left: 10px;
    top: -1px;
    width: 0;
    height: 0;
    border: 9px solid transparent;
    border-bottom-color: #cc3333;
}

div .go-top div .stick {
    position: absolute;
    left: 15px;
    top: 15px;
    width: 8px;
    height: 14px;
    display: block;
    background-color: #cc3333;
    -webkit-border-radius: 1px;
    -moz-border-radius: 1px;
    border-radius: 1px;
}

使用fixed定位,让按钮始终出现在右下角,通过设定left:90%可以使按钮在右方出现,但又不会太紧贴滚动条。

3.按钮默认不可见,当滚动页面到一定高度后,按钮出现

$(function() {
    $(window).scroll(function() {
        if ($(window).scrollTop() > 1000)
            $('div.go-top').show();
        else
            $('div.go-top').hide();
    });
    $('div.go-top').click(function() {
        $('html, body').animate({scrollTop: 0}, 1000);
    });
});

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转载自blog.csdn.net/u010340022/article/details/49359037