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javascript - 我如何在这些元素的 hide() 和 show() 效果上添加过渡效果？

在下面的 SSCCE 中，我如何使用 show() 动画显示 .item，并使用 hide() 动画隐藏它们，以便看起来像 item5、item6、item7、item8 飞入了视口？

也就是说，我想要的是，当点击 .next-arrow 时，例如第一次点击，item1、item2、item3、item4 隐藏，而 item5、item6、item7、item8 显示时，能够有“过渡”效果——就像这个网站中新页面流入视口一样。

我该怎么做？

$(document).ready(function() {
  //alert('ready');//check

  var numberOfItems = $('.item').length;
  //alert('numberOfItems => ' + numberOfItems);//check

  displayNextArrowOnCondition();
  displayPreviousArrowOnCondition();



  /**
   *
   **/
  $('a.next-arrow').click(function(event) {
    event.preventDefault();

    var currentFirstItem = getCurrentFirstItem(); // Difference between var and no var SO: If you're in the global scope then there's no difference. If you're in a function then var will create a local variable, "no var" will look up the scope chain until it finds the variable or hits the global scope (at which point it will create it):

    $('div.item' + currentFirstItem).hide(); //We don't need to have the condition of checking this element's existence because the next-arrow whose handler this method is, appears only if the numberOfItems is greater than the id of the item with the greatest id among the elements currently visible on the screen.
    if (('div.item' + (currentFirstItem + 1)).length) { //SO: How can I check the existence of an element in jQuery?? In JavaScript, everything is truthy or falsy and for numbers, 0 means false, everything else true. So you could write: "if ($(selector).length)" - and you don't need that > 0 part.
      $('div.item' + (currentFirstItem + 1)).hide();
    }
    if (('div.item' + (currentFirstItem + 2)).length) {
      $('div.item' + (currentFirstItem + 2)).hide();
    }
    if (('div.item' + (currentFirstItem + 3)).length) {
      $('div.item' + (currentFirstItem + 3)).hide();
    }

    hidePreviousArrow();
    hideNextArrow();

    displayPreviousArrowOnCondition();
    displayNextArrowOnCondition();
  });


  /**
   *
   **/
  $('a.previous-arrow').click(function(event) {
    event.preventDefault();

    var currentFirstItem = getCurrentFirstItem();

    $('div.item' + (currentFirstItem - 1)).show();

    if (('div.item' + (currentFirstItem - 2)).length) {
      $('div.item' + (currentFirstItem - 2)).show();
    }
    if (('div.item' + (currentFirstItem - 3)).length) {
      $('div.item' + (currentFirstItem - 3)).show();
    }
    if (('div.item' + (currentFirstItem - 4)).length) {
      $('div.item' + (currentFirstItem - 4)).show();
    }

    hidePreviousArrow();
    hideNextArrow();

    displayPreviousArrowOnCondition();
    displayNextArrowOnCondition();
  });



  /**
   * DISPLAY NEXT ARROW WHEN
   * 1. NUMBER OF ITEMS IS GREATER THAN THE id OF THE LAST ITEM DISPLAYED IN THE CURRENT VIEWPORT
   **/
  function displayNextArrowOnCondition() {
    //alert('displayNextArrowOnCondition called');//check
    //Iterate through items in OPPOSTIE order, and when found the first one which is not hidden by hide() or display:none, assign it to currentLastItem (because this is the first item in the viewport), and break out from the loop.
    var currentLastItem = getCurrentLastItem();
    //alert('currentLastItem -> ' + currentLastItem);//check
    if (currentLastItem < numberOfItems) {
      $('a.next-arrow').css('display', 'block');
      $('.wrapper').mouseover(function() {
        //$('a.next-arrow').css('visibility', 'visible');
      });
      $('.wrapper').mouseleave(function() {
        //$('a.next-arrow').css('visibility', 'hidden');
      });
    }
  }


  /**
   * DISPLAY PREVIOUS ARROW WHEN
   * 1. THE id OF THE FIRST DISPLAYED ITEM IS GREATER THAN 4
   **/
  function displayPreviousArrowOnCondition() {
    //Iterate through items in order, and when found the first one which is not hidden by hide() or display:none, assign it to currentFirstItem (because this is the first item in the viewport), and break out from the loop.
    var currentFirstItem = getCurrentFirstItem();
    if (currentFirstItem > 4) {
      $('a.previous-arrow').css('display', 'block');
      $('.wrapper').mouseover(function() {
        $('a.previous-arrow').css('visibility', 'visible');
      });
      $('.wrapper').mouseleave(function() {
        $('a.previous-arrow').css('visibility', 'hidden');
      });
    }
  }


  /**
   * DISPLAY:NONE NEXT ARROW IF IT IS VISIBLE
   **/
  function hideNextArrow() {
    //alert('hideNextArrow called');//check
    if ($('a.next-arrow').css('display').toLowerCase() == 'block') { //The == operator will compare for equality after doing any necessary type conversions. The === operator will not do the conversion, so if two values are not the same type === will simply return false.| Just in case anyone was wondering in 2012: === is way faster than ==. jsperf.com/comparison-of-comparisons.
      //alert('YES if ($(\'a.next-arrow\').attr(\'display\').toLowerCase() == \'block\'). SO I AM CHANGING IT TO none.');//check
      $('a.next-arrow').css('display', 'none');
    } //else { alert('NO  if ($(\'a.next-arrow\').attr(\'display\').toLowerCase() == \'block\').'); } //check
  }


  /**
   * DISPLAY:NONE PREVIOUS ARROW IF IT IS VISIBLE
   **/
  function hidePreviousArrow() {
    //alert('hidePreviousArrow called');//check
    //alert($('a.previous-arrow').css('display'));//check
    if ($('a.previous-arrow').css('display') == 'block') {
      //alert('YES if ($(\'a.previous-arrow\').attr(\'display\').toLowerCase() == \'block\'). SO I AM CHANGING IT TO none.');//check
      $('a.previous-arrow').css('display', 'none');
    } //else { alert('NO  if ($(\'a.previous-arrow\').attr(\'display\').toLowerCase() == \'block\').'); } //check
  }


  /**
   *
   **/
  function getCurrentFirstItem() {
    for (i = 1; i <= numberOfItems; i++) {
      if ($("#" + i).visible(true, true)) {
        //alert('YES if (  $("#"+i).visible(true, true)  )');//check
        currentFirstItem = i;
        break;
      } //else { //alert('NO if (  $("#"+i).visible(true, true)  )'); }//check 
    }
    //alert('currentFirstItem -> ' + currentFirstItem);//check
    return currentFirstItem;
  }


  /**
   *
   **/
  function getCurrentLastItem() {
    for (j = numberOfItems; j >= 1; j--) {
      if ($("#" + j).visible(true, true)) {
        //alert("YES if (  $(\"#\"+j).visible(true, true) ) ");//check
        currentLastItem = j;
        break;
      } //else { //alert('NO if (  $("#"+j).visible(true, true) )'); } //check
    }
    //alert('currentLastItem -> ' + currentLastItem);//check
    return currentLastItem;
  }

});
html,
body,
body div,
span,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
abbr,
address,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
samp,
small,
strong,
sub,
sup,
var,
b,
i,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
figure,
footer,
header,
hgroup,
menu,
nav,
section,
time,
mark,
audio,
video,
details,
summary {
  margin: 0px;
  padding: 0px;
  border: 0px none;
  background: transparent none repeat scroll 0% 0%;
  font-size: 100%;
  vertical-align: baseline;
}
.wrapper {
  position: relative;
  white-space: nowrap;
  overflow: hidden;
}
div.item {
  /*position:absolute;*/
  display: inline-block;
  width: 25%;
  height: 25vw;
}
.item1 {
  left: 0%;
  background-color: wheat;
}
.item2 {
  left: 25%;
  background-color: pink;
}
.item3 {
  left: 50%;
  background-color: beige;
}
.item4 {
  left: 75%;
  background-color: gainsboro;
}
.item5 {
  left: 100%;
  background-color: coral;
}
.item6 {
  left: 125%;
  background-color: crimson;
}
.item7 {
  left: 150%;
  background-color: aquamarine;
}
.item8 {
  left: 175%;
  background-color: darkgoldenrod;
}
.item9 {
  left: 200%;
  background-color: khaki;
}
.item10 {
  left: 225%;
  background-color: indianred;
}
.item11 {
  left: 250%;
  background-color: mediumspringgreen;
}
.previous-arrow,
.next-arrow {
  width: 30px;
  height: 50%;
  top: 50%;
  position: absolute;
  opacity: 0.7;
  color: white;
  background-repeat: no-repeat;
  margin-top: -30px;
  display: none;
}
.previous-arrow {
  background-image: url(a2.png);
  left: 0px;
}
.next-arrow {
  background-image: url(b2.png);
  right: 0px;
}
.previous-arrow,
.next-arrow {
  opacity: 1;
}
body {
  background-color: black;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://cdn.jsdelivr.net/jquery.visible/1.1.0/jquery.visible.min.js"></script>

<div class="wrapper">
  <a class="previous-arrow" href="">&gt;</a>-->
  <!--
		-->
  <div id="1" class="item item1 wheat">a.</div>
  <!--
		-->
  <div id="2" class="item item2 pink">a.</div>
  <!--
		-->
  <div id="3" class="item item3 beige">a.</div>
  <!--
		-->
  <div id="4" class="item item4 gainsboro">a.</div>
  <!--
		-->
  <div id="5" class="item item5 coral">a.</div>
  <!--
		-->
  <div id="6" class="item item6 crimson">a.</div>
  <!--
		-->
  <div id="7" class="item item7 darkgoldenrod">a.</div>
  <!--
		-->
  <div id="8" class="item item8 aquamarine">a.</div>
  <!--
		-->
  <div id="9" class="item item9 aquamarine">a.</div>
  <!--
		-->
  <div id="10" class="item item10 aquamarine">a.</div>
  <!--
		-->
  <div id="11" class="item item11 aquamarine">a.</div>
  <!--
		--><a class="next-arrow" href="">&lt;</a>	
</div>

答案＃1

如果你只想使用 show() 和 hide()，你可以使用 show('slow') 和 hide('slow')，等等。除此之外，你可以使用许多其他方法和效果。

请点击此链接了解有多少种方法可以做到这一点。

jQuery 效果

答案＃2

您可以使用 CSS 过渡或 CSS 动画。动画如：

  1. 定义 CSS 类规则并将类名分配给你想要动画的元素

.doFadeIn {
    -webkit-animation:fadeInSlide forwards ease-in 150ms;
    animation:fadeInSlide forwards ease-in 150ms;
}
.doFadeOut {
    -webkit-animation:fadeOutSlideDown forwards ease-out 150ms;
    animation:fadeOutSlideDown forwards ease-out 150ms;
}
  1. 为动画定义关键帧

    @keyframes fadeInSlide
    {
         0% { opactity:0; transform: translateX(-100px); }
         100% { opactity:1; transform: translateX(0); }
    }

当将 doFadeIn 分配给元素的类名时，它们将：淡入 - 不透明度：0 到 1（从 0% 可见到 100% 可见）沿水平轴 (X) 移动，从元素原始位置左侧 100px 到其原始位置。

它将在150毫秒的时间内完成这个动作

<div id="my-widget1" class="my-widget"><div>
  
<div id="my-widget1" class="my-widget doFadeIn"><div>