使用 CSS 链接到顶部和底部

Question

谁能告诉我创建跳转页面链接的好方法是什么？

我已经有一个用于 to-go-top 的并且工作得很好，但是我在创建一个用于 to-go-bottom 的时候遇到了一些麻烦。

这就是我想要做的（很明显，底部的图像我有不同的图像）：

<a href="#Top" name="Top" id="Top" class="cd-top cd-is-visible cd-fade-out" >Top</a>
<a href="#Bot" name="Bot" id="Bot" class="cd-bottom cd-is-visible cd-fade-out">Bottom</a>

这是我正在使用的 CSS：

/******************** Back to top and/or bottom ********************/
.cd-top {
  display: inline-block;
  height: 40px;
  width: 40px;
  position: fixed;
  top: 45%;
  right: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  /* image replacement properties */
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  background: #03a400 url(images/cd-top-arrow.svg) no-repeat center 50%;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: opacity .3s 0s, visibility 0s .3s;
  -moz-transition: opacity .3s 0s, visibility 0s .3s;
  transition: opacity .3s 0s, visibility 0s .3s;
}

.cd-top.cd-is-visible, .cd-top.cd-fade-out, .no-touch .cd-top:hover {
  -webkit-transition: opacity .3s 0s, visibility 0s 0s;
  -moz-transition: opacity .3s 0s, visibility 0s 0s;
  transition: opacity .3s 0s, visibility 0s 0s;
}
.cd-top.cd-is-visible {
  /* the button becomes visible */
  visibility: visible;
  opacity: 63;
}
.cd-top.cd-fade-out {
  /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
  /*    opacity: .5; */
}
.cd-top:hover {
  background-color: #489148;
  opacity: 1;
}

.cd-bottom {
  display: inline-block;
  height: 40px;
  width: 40px;
  position: fixed;
  bottom: 45%;
  right: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  /* image replacement properties */
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  background: #03a400 url(images/cd-bottom-arrow.png) no-repeat center 50%;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: opacity .3s 0s, visibility 0s .3s;
  -moz-transition: opacity .3s 0s, visibility 0s .3s;
  transition: opacity .3s 0s, visibility 0s .3s;
}

这是我正在使用的 Javascript：

;jQuery(document).ready(function($){
    // browser window scroll (in pixels) after which the "back to top" link is shown
    var offset = 300,
        //browser window scroll (in pixels) after which the "back to top" link opacity is reduced
        offset_opacity = 1200,
        //duration of the top scrolling animation (in ms)
        scroll_top_duration = 700,
        //grab the "back to top" link
        $back_to_top = $('.cd-top');

        //grab the "back to bottom" link
        $back_to_bottom = $('.cd-bottom');      

    //hide or show the "back to top" link
    $(window).scroll(function(){
        ( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');
        if( $(this).scrollTop() > offset_opacity ) {
            $back_to_top.addClass('cd-fade-out');
        }
    });

    //smooth scroll to top
    $back_to_top.on('click', function(event){
        event.preventDefault();
        $('body,html').animate({
            scrollTop: 0 ,
            }, scroll_top_duration
        );
    });

    //hide or show the "back to bottom" link
    $(window).scroll(function(){
        ( $(this).scrollBottom() > offset ) ? $back_to_bottom.addClass('cd-is-visible') : $back_to_bottom.removeClass('cd-is-visible cd-fade-out');
        if( $(this).scrollBottom() > offset_opacity ) {
            $back_to_bottom.addClass('cd-fade-out');
        }
    });

    //smooth scroll to bottom
    $back_to_bottom.on('click', function(event){
        event.preventDefault();
        $('body,html').animate({
            scrollTop: 0 ,
            }, scroll_top_duration
        );
    });

});

由于某些原因，我无法让第二个按钮出现在 screen.If 有人可以告诉我更好的方法或告诉我我的错误在哪里我将不胜感激

提前致谢。

Answer 1

编辑：

点击按钮不起作用，因为您已将 scrollTop 设置为 0。如果您将其更新为页面的高度，则它会起作用。这是更新后的 fiddle，带有可滚动页面：http://jsfiddle.net/twvn1z3s/7/

假设这是你的整个 CSS - 你需要对你的 CSS 做一些小的调整。例如，您定义：

.cd-top.cd-is-visible 您设置 opacity/visibility 的位置，但不是 bottom 按钮。

修改旧规则为：

.cd-top.cd-is-visible,
.cd-bottom.cd-is-visible{
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
}

它会出现。一旦底部按钮可见，您需要调整按钮的位置，使它们不重叠（因为它们都将偏移设置为导致轻微重叠的值）- 我在这里将顶部设置为 30%：http://jsfiddle.net/twvn1z3s/2/

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