为什么我的动画在滚动时触发的次数超过一次？

时间：2016-09-22 20:19:05

标签： javascript jquery html css

在滚动动画一次后如何停止动画？请解释为什么它动画多了一次以及如何解决它！我是javascript / jquery的新手，所以请简单解释一下。非常感谢！

$(document).ready(function(){

//MENU
    $('.menu-icon').click(function(){
       $('.menu-nav').animate({
            height: 'toggle'
          }, 200
       );
  });


//SKILLS
  $(window).scroll(function() {
    if ($(this).scrollTop() > 40) {
        // apply effects and animations
        $('.bar').animate({
          width: 'toggle'
        }, 2000
      );
    }
});

});
/*
html5doctor.com Reset Stylesheet
v1.6.1
Last Updated: 2010-09-17
Author: Richard Clark - http://richclarkdesign.com
Twitter: @rich_clark
*/
html, 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, canvas, details, figcaption, figure,
footer, header, hgroup, menu, nav, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  font-size: 100%;
  vertical-align: baseline;
  /*background:transparent;*/
}

body {
  line-height: 1;
}

article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
  display: block;
}

nav ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

a {
  margin: 0;
  padding: 0;
  font-size: 100%;
  vertical-align: baseline;
  background: transparent;
}

header {
  background-color: #37474F;
}

header .menu-icon {
  padding: 5px 0 5px 10px;
  cursor: pointer;
  width: 50px;
}

header .menu-icon img {
  width: 50px;
  height: 50px;
}

header .menu {
  width: 100%;
  border-bottom: solid #18FFFF 1px;
  border-width: 70%;
}

header .menu:before {
  content: " ";
  display: block;
  width: 90%;
  height: 5px;
  position: absolute;
  margin: 0 auto;
  left: 0;
  right: 0;
  background-color: #18FFFF;
}

header .menu .menu-nav {
  z-index: 2;
  position: absolute;
  background-color: #18FFFF;
  width: 90%;
  margin: 0 auto;
  left: 0;
  right: 0;
  border-bottom-radius: 5px;
  display: none;
}

header .menu .menu-nav ul {
  margin-top: 20px;
}

header .menu .menu-nav ul li {
  text-align: center;
  padding: 10px;
  list-style: none;
  border-radius: 5x;
  font-size: 2em;
  cursor: pointer;
}

header .menu .menu-nav ul li:hover {
  /*background-color: #607D8B;*/
  background-color: #37474F;
  color: #18FFFF;
}

header .menu h1 {
  text-align: center;
  padding-top: 20px;
}

header .menu .menu-social {
  width: 170px;
  margin: 100px auto;
  margin-bottom: 20px;
}

header .menu .menu-social img {
  cursor: pointer;
  margin: 0 1px 0 1px;
}

header .menu .menu-social img:hover {
  border: solid #37474F 1px;
}

header .bio {
  width: 70%;
  margin: 20px auto;
  margin-bottom: 0;
}

header .bio .hello h1 {
  font-size: 4em;
  color: #18FFFF;
  text-align: center;
  padding-bottom: 20px;
}

header .bio .desc p {
  color: white;
  text-align: center;
  line-height: 25px;
}

header .bio .desc .skills {
  padding-top: 20px;
  padding-bottom: 80px;
}

.skills-2 {
  width: 100%;
  background-color: #18FFFF;
  overflow: hidden;
}

.skills-2 h1 {
  text-align: center;
  font-size: 2em;
}

.skills-2 .my-skills {
  width: 40%;
  padding-top: 20px;
  float: left;
}

.skills-2 .my-skills ul li {
  text-align: center;
}

.skills-2 .graph {
  float: left;
  width: 60%;
  padding-top: 20px;
}

.skills-2 .graph .html {
  width: 100px;
}

.skills-2 .graph .css {
  width: 70px;
}

.skills-2 .graph .javascript {
  width: 50px;
}

.skills-2 .graph .bar {
  height: 10px;
  background-color: red;
  margin-bottom: 9px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
 <body>
    <div class="wrapper">
      <header>
        <div class="menu-icon">
          <img src="images/Menu-64.png">
        </div><!--menu-icon-->
        <div class="menu">
          <div class="menu-nav">
            <ul>
              <li>Home</li>
              <li>Work</li>
              <li>Contact</li>
            </ul>

            <div class="menu-social">
              <img src="images/Instagram.png" alt="instagram" />
              <img src="images/Twitter.png" alt="twitter" />
              <img src="images/LinkedIn.png" alt="linkedin" />
            </div>
          </div><!--menu-nav-->
        </div>

        <div class="bio">

          <div class="hello">
            <h1>Hello...</h>
          </div><!--Hello-->

          <div class="desc">
            <p>Lorem ipsum dolor sit amet, gravida urna cras a iaculis rhoncus. Nunc arcu eget nec posuere quam duis, euismod nunc cras fermentum, nibh pellentesque</p>
            <div class="skills">
               <p>Lorem ipsum dolor sit amet, gravida urna cras a iaculis rhoncus.</p>
            </div><!--Skills-->
          </div><!--Desc-->

        </div><!--Bio-->
      </header>

      <div class="skills-2">
        <h1>Skills</h1>
        <div class="my-skills">
          <ul>
            <li>Lorem ipsum</li>
            <li>Lorem ipsum</li>
            <li>Lorem ipsum</li>
          </ul>
        </div><!--My SKills-->
        <div class="graph">
          <div class="html bar">
          </div>
          <div class="css bar">
          </div>
          <div class="javascript bar">
          </div>
      </div><!--Graph-->
      </div><!--SKills 2-->

    </div><!--Wrapper-->
  </body>

2 个答案:

答案 0 :(得分：0)

使用库或插件启用scrollstart事件以防止滚动事件继续触发：

$(window).on("scrollstart", function() {
if ($(this).scrollTop() > 40) {
    // apply effects and animations
    flagscroll=false;
    $('.bar').animate({
      width: 'toggle'
    }, 2000
  );
}

注意 - 仅仅因为你有一个滚动监听器并不意味着滚动事件每次只触发一次鼠标滚轮。试试这个 - 在你的$（window）.scroll行下面添加console.log（＆＃39; Scroll＆＃39;）你会看到15个字符串Scroll的实例

答案 1 :(得分：0)

$(document).ready(function(){

//MENU
    $('.menu-icon').click(function(){
       $('.menu-nav').animate({
            height: 'toggle'
          }, 200
       );
  });


//SKILLS
  flagScroll = true;
  $(window).scroll(function() {
    if ($(this).scrollTop() > 40 && flagScroll) {
        // apply effects and animations
        flagScroll= false;
        $('.bar').animate({
          width: 'toggle'
        }, 2000
      );
    }
});

});
/*
html5doctor.com Reset Stylesheet
v1.6.1
Last Updated: 2010-09-17
Author: Richard Clark - http://richclarkdesign.com
Twitter: @rich_clark
*/
html, 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, canvas, details, figcaption, figure,
footer, header, hgroup, menu, nav, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  font-size: 100%;
  vertical-align: baseline;
  /*background:transparent;*/
}

body {
  line-height: 1;
}

article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
  display: block;
}

nav ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

a {
  margin: 0;
  padding: 0;
  font-size: 100%;
  vertical-align: baseline;
  background: transparent;
}

header {
  background-color: #37474F;
}

header .menu-icon {
  padding: 5px 0 5px 10px;
  cursor: pointer;
  width: 50px;
}

header .menu-icon img {
  width: 50px;
  height: 50px;
}

header .menu {
  width: 100%;
  border-bottom: solid #18FFFF 1px;
  border-width: 70%;
}

header .menu:before {
  content: " ";
  display: block;
  width: 90%;
  height: 5px;
  position: absolute;
  margin: 0 auto;
  left: 0;
  right: 0;
  background-color: #18FFFF;
}

header .menu .menu-nav {
  z-index: 2;
  position: absolute;
  background-color: #18FFFF;
  width: 90%;
  margin: 0 auto;
  left: 0;
  right: 0;
  border-bottom-radius: 5px;
  display: none;
}

header .menu .menu-nav ul {
  margin-top: 20px;
}

header .menu .menu-nav ul li {
  text-align: center;
  padding: 10px;
  list-style: none;
  border-radius: 5x;
  font-size: 2em;
  cursor: pointer;
}

header .menu .menu-nav ul li:hover {
  /*background-color: #607D8B;*/
  background-color: #37474F;
  color: #18FFFF;
}

header .menu h1 {
  text-align: center;
  padding-top: 20px;
}

header .menu .menu-social {
  width: 170px;
  margin: 100px auto;
  margin-bottom: 20px;
}

header .menu .menu-social img {
  cursor: pointer;
  margin: 0 1px 0 1px;
}

header .menu .menu-social img:hover {
  border: solid #37474F 1px;
}

header .bio {
  width: 70%;
  margin: 20px auto;
  margin-bottom: 0;
}

header .bio .hello h1 {
  font-size: 4em;
  color: #18FFFF;
  text-align: center;
  padding-bottom: 20px;
}

header .bio .desc p {
  color: white;
  text-align: center;
  line-height: 25px;
}

header .bio .desc .skills {
  padding-top: 20px;
  padding-bottom: 80px;
}

.skills-2 {
  width: 100%;
  background-color: #18FFFF;
  overflow: hidden;
}

.skills-2 h1 {
  text-align: center;
  font-size: 2em;
}

.skills-2 .my-skills {
  width: 40%;
  padding-top: 20px;
  float: left;
}

.skills-2 .my-skills ul li {
  text-align: center;
}

.skills-2 .graph {
  float: left;
  width: 60%;
  padding-top: 20px;
}

.skills-2 .graph .html {
  width: 100px;
}

.skills-2 .graph .css {
  width: 70px;
}

.skills-2 .graph .javascript {
  width: 50px;
}

.skills-2 .graph .bar {
  height: 10px;
  background-color: red;
  margin-bottom: 9px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
 <body>
    <div class="wrapper">
      <header>
        <div class="menu-icon">
          <img src="images/Menu-64.png">
        </div><!--menu-icon-->
        <div class="menu">
          <div class="menu-nav">
            <ul>
              <li>Home</li>
              <li>Work</li>
              <li>Contact</li>
            </ul>

            <div class="menu-social">
              <img src="images/Instagram.png" alt="instagram" />
              <img src="images/Twitter.png" alt="twitter" />
              <img src="images/LinkedIn.png" alt="linkedin" />
            </div>
          </div><!--menu-nav-->
        </div>

        <div class="bio">

          <div class="hello">
            <h1>Hello...</h>
          </div><!--Hello-->

          <div class="desc">
            <p>Lorem ipsum dolor sit amet, gravida urna cras a iaculis rhoncus. Nunc arcu eget nec posuere quam duis, euismod nunc cras fermentum, nibh pellentesque</p>
            <div class="skills">
               <p>Lorem ipsum dolor sit amet, gravida urna cras a iaculis rhoncus.</p>
            </div><!--Skills-->
          </div><!--Desc-->

        </div><!--Bio-->
      </header>

      <div class="skills-2">
        <h1>Skills</h1>
        <div class="my-skills">
          <ul>
            <li>Lorem ipsum</li>
            <li>Lorem ipsum</li>
            <li>Lorem ipsum</li>
          </ul>
        </div><!--My SKills-->
        <div class="graph">
          <div class="html bar">
          </div>
          <div class="css bar">
          </div>
          <div class="javascript bar">
          </div>
      </div><!--Graph-->
      </div><!--SKills 2-->

    </div><!--Wrapper-->
  </body>

这对你有用吗？

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