窗口只滚动一次火

Question

我有一个问题，我有图表动画，一切看起来都不错但是......我希望这段代码只能启动一个，但是每次向下滚动或向上滚动图表都会再次启动。看，每个卷轴上的百分比描述再次开始。是否只能首先滚动此代码？谢谢你的帮助

＆＃13;

＆＃13;

$(window).scroll(function() {
    if ($(this).scrollTop() >= $('.holder').offset().top) {
        $('.bar').each(function(i) {
            var $bar = $(this);
            $(this).append('<span class="count"></span>')
            setTimeout(function() {
                $bar.css('width', $bar.attr('data-percent'));
            }, i * 100);
        });

        $('.count').each(function() {
            $(this).prop('Counter', 0).animate({
                Counter: $(this).parent('.bar').attr('data-percent')
            }, {
                duration: 2000,
                easing: 'swing',
                step: function(now) {
                    $(this).text(Math.ceil(now) + '%');
                }
            });
        });
    }
})

＆＃13;

@import url(http://fonts.googleapis.com/css?family=Droid+Serif:400, 400italic|Montserrat:400, 700);
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    font-size: 100%;
    vertical-align: baseline;
}
html {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
caption, th, td {
    text-align: left;
    font-weight: normal;
    vertical-align: middle;
}
q, blockquote {
    quotes: none;
}
q:before, q:after, blockquote:before, blockquote:after {
    content:"";
    content: none;
}
a img {
    border: none;
}
article, aside, details, figcaption, figure, footer, header, hgroup, main, menu, nav, section, summary {
    display: block;
}
* {
    box-sizing: border-box;
}
body {
    color: #333;
    -webkit-font-smoothing: antialiased;
    font-family:"Montserrat", sans-serif;
    padding: 2%;
}
.wrap {
    width: 50%;
    margin: 0 auto;
}
h1 {
    font-family:"Montserrat", sans-serif;
    font-weight: bold;
    text-align: center;
    font-size: 1.5em;
    padding: .5em 0;
    margin-bottom: 1em;
    border-bottom: 1px solid #dadada;
    letter-spacing: 3px;
    text-transform: uppercase;
}
ul li {
    line-height: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
    font-size: .85em;
    text-transform: uppercase;
    clear: both;
}
ul li:before {
    content:"\2023";
    padding: 0 1em 0 0;
}
.bar {
    background: #e74c3c;
    width: 0;
    margin: .25em 0;
    color: #fff;
    position: relative;
    transition: width 2s, background .2s;
    clear: both;
}
.bar:nth-of-type(2n) {
    background: #ed7669;
}
.bar .label {
    font-size: .75em;
    padding: 1em;
    background: #3d3d3d;
    width: 8em;
    display: inline-block;
    position: relative;
    z-index: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}
.bar .label.light {
    background: #575757;
}
.count {
    position: absolute;
    right: .25em;
    top: .75em;
    padding: .15em;
    font-size: .75em;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrap">
     <h1>Animated Bar Graphs</h1>

    <div class="holder">
        <div class="bar cf" data-percent="85%"><span class="label">Photoshop</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label light">Illustrator</span>
        </div>
        <div class="bar cf" data-percent="65%"><span class="label">Indesign</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label light">HTML</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label">CSS</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">jQuery</span>
        </div>
        <div class="bar cf" data-percent="85%"><span class="label light">RWD</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label">PHP</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">WordPress</span>
        </div>
        <div class="bar cf" data-percent="70%"><span class="label">SASS/SCSS</span>
        </div>
    </div>
</div>

＆＃13;

＆＃13;

＆＃13;

Answer 1

您的脚本只需将span附加到holder div。所以检查它是否已经span count级。如果是这样，继续。

 $(window).on("scroll", function() {
    if ($(this).scrollTop() >= $('.holder').offset().top) {
        $('.bar').each(function(i) {
            var $bar = $(this);
          if($(this).find('span.count').length !== 0) return;
  
            console.log("span is added");

            $(this).append('<span class="count"></span>')
            setTimeout(function() {
                $bar.css('width', $bar.attr('data-percent'));
            }, i * 100);
            $(window).off('scroll'); 
        });

        $('.count').each(function() {
            $(this).prop('Counter', 0).animate({
                Counter: $(this).parent('.bar').attr('data-percent')
            }, {
                duration: 2000,
                easing: 'swing',
                step: function(now) {
                    $(this).text(Math.ceil(now) + '%');
                }
            });
        });
    }
})

@import url(http://fonts.googleapis.com/css?family=Droid+Serif:400, 400italic|Montserrat:400, 700);
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    font-size: 100%;
    vertical-align: baseline;
}
html {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
caption, th, td {
    text-align: left;
    font-weight: normal;
    vertical-align: middle;
}
q, blockquote {
    quotes: none;
}
q:before, q:after, blockquote:before, blockquote:after {
    content:"";
    content: none;
}
a img {
    border: none;
}
article, aside, details, figcaption, figure, footer, header, hgroup, main, menu, nav, section, summary {
    display: block;
}
* {
    box-sizing: border-box;
}
body {
    color: #333;
    -webkit-font-smoothing: antialiased;
    font-family:"Montserrat", sans-serif;
    padding: 2%;
}
.wrap {
    width: 50%;
    margin: 0 auto;
}
h1 {
    font-family:"Montserrat", sans-serif;
    font-weight: bold;
    text-align: center;
    font-size: 1.5em;
    padding: .5em 0;
    margin-bottom: 1em;
    border-bottom: 1px solid #dadada;
    letter-spacing: 3px;
    text-transform: uppercase;
}
ul li {
    line-height: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
    font-size: .85em;
    text-transform: uppercase;
    clear: both;
}
ul li:before {
    content:"\2023";
    padding: 0 1em 0 0;
}
.bar {
    background: #e74c3c;
    width: 0;
    margin: .25em 0;
    color: #fff;
    position: relative;
    transition: width 2s, background .2s;
    clear: both;
}
.bar:nth-of-type(2n) {
    background: #ed7669;
}
.bar .label {
    font-size: .75em;
    padding: 1em;
    background: #3d3d3d;
    width: 8em;
    display: inline-block;
    position: relative;
    z-index: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}
.bar .label.light {
    background: #575757;
}
.count {
    position: absolute;
    right: .25em;
    top: .75em;
    padding: .15em;
    font-size: .75em;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrap">
     <h1>Animated Bar Graphs</h1>

    <div class="holder">
        <div class="bar cf" data-percent="85%"><span class="label">Photoshop</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label light">Illustrator</span>
        </div>
        <div class="bar cf" data-percent="65%"><span class="label">Indesign</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label light">HTML</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label">CSS</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">jQuery</span>
        </div>
        <div class="bar cf" data-percent="85%"><span class="label light">RWD</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label">PHP</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">WordPress</span>
        </div>
        <div class="bar cf" data-percent="70%"><span class="label">SASS/SCSS</span>
        </div>
    </div>
</div>

Answer 2

您可以使用.on并取消内部事件的链接：

$(window).on('scroll',function() {
    if ($(this).scrollTop() >= $('.holder').offset().top) {
        $('.bar').each(function(i) {
            var $bar = $(this);
            $(this).append('<span class="count"></span>')
            setTimeout(function() {
                $bar.css('width', $bar.attr('data-percent'));
            }, i * 100);
        });
        $(window).off('scroll'); 
        $('.count').each(function() {
            $(this).prop('Counter', 0).animate({
                Counter: $(this).parent('.bar').attr('data-percent')
            }, {
                duration: 2000,
                step: function(now) {
                    $(this).text(Math.ceil(now) + '%');
                }
            });
        });
    }
});

@import url(http://fonts.googleapis.com/css?family=Droid+Serif:400, 400italic|Montserrat:400, 700);
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    font-size: 100%;
    vertical-align: baseline;
}
html {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
caption, th, td {
    text-align: left;
    font-weight: normal;
    vertical-align: middle;
}
q, blockquote {
    quotes: none;
}
q:before, q:after, blockquote:before, blockquote:after {
    content:"";
    content: none;
}
a img {
    border: none;
}
article, aside, details, figcaption, figure, footer, header, hgroup, main, menu, nav, section, summary {
    display: block;
}
* {
    box-sizing: border-box;
}
body {
    color: #333;
    -webkit-font-smoothing: antialiased;
    font-family:"Montserrat", sans-serif;
    padding: 2%;
}
.wrap {
    width: 50%;
    margin: 0 auto;
}
h1 {
    font-family:"Montserrat", sans-serif;
    font-weight: bold;
    text-align: center;
    font-size: 1.5em;
    padding: .5em 0;
    margin-bottom: 1em;
    border-bottom: 1px solid #dadada;
    letter-spacing: 3px;
    text-transform: uppercase;
}
ul li {
    line-height: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
    font-size: .85em;
    text-transform: uppercase;
    clear: both;
}
ul li:before {
    content:"\2023";
    padding: 0 1em 0 0;
}
.bar {
    background: #e74c3c;
    width: 0;
    margin: .25em 0;
    color: #fff;
    position: relative;
    transition: width 2s, background .2s;
    clear: both;
}
.bar:nth-of-type(2n) {
    background: #ed7669;
}
.bar .label {
    font-size: .75em;
    padding: 1em;
    background: #3d3d3d;
    width: 8em;
    display: inline-block;
    position: relative;
    z-index: 2;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}
.bar .label.light {
    background: #575757;
}
.count {
    position: absolute;
    right: .25em;
    top: .75em;
    padding: .15em;
    font-size: .75em;
    font-weight: bold;
    font-family:"Montserrat", sans-serif;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrap">
     <h1>Animated Bar Graphs</h1>

    <div class="holder">
        <div class="bar cf" data-percent="85%"><span class="label">Photoshop</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label light">Illustrator</span>
        </div>
        <div class="bar cf" data-percent="65%"><span class="label">Indesign</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label light">HTML</span>
        </div>
        <div class="bar cf" data-percent="90%"><span class="label">CSS</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">jQuery</span>
        </div>
        <div class="bar cf" data-percent="85%"><span class="label light">RWD</span>
        </div>
        <div class="bar cf" data-percent="75%"><span class="label">PHP</span>
        </div>
        <div class="bar cf" data-percent="80%"><span class="label light">WordPress</span>
        </div>
        <div class="bar cf" data-percent="70%"><span class="label">SASS/SCSS</span>
        </div>
    </div>
</div>