javascript - 如何让图像在滚动时调整大小？

我喜欢这段代码 http://codepen.io/Nickies/pen/ZYwJZM但想知道如何用图像来做。

仅用图像替换文本是行不通的。所以我想知道如何调整代码以处理图像。

我的尝试: http://codepen.io/Dingerzat/pen/pNJoma

HTML

<!-- title and meta -->
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<meta name="description" content="" />
<title>Header Resize On Scroll with Animations</title>

<!-- css -->
<link href='http://fonts.googleapis.com/css?family=Ubuntu:300,400,700,400italic' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Oswald:400,300,700' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="css/style.css" />

<!-- js -->
<script src="js/classie.js"></script>
<script>
    function init() {
        window.addEventListener('scroll', function(e){
            var distanceY = window.pageYOffset || document.documentElement.scrollTop,
                shrinkOn = 300,
                header = document.querySelector("header");
            if (distanceY > shrinkOn) {
                classie.add(header,"smaller");
            } else {
                if (classie.has(header,"smaller")) {
                    classie.remove(header,"smaller");
                }
            }
        });
    }
    window.onload = init();
</script>
</head>



<body>

<div id="wrapper">

<header>
    <div class="container clearfix">
        <h1 id="logo">
            <img src="https://placeholdit.imgix.net/~text?txtsize=33&txt=350%C3%97150&w=350&h=150">
        </h1>
        <nav>
            <a href="">Lorem</a>
            <a href="">Ipsum</a>
            <a href="">Dolor</a>
        </nav>
    </div>
</header><!-- /header -->

<div id="main">
    <div id="content">
        <section>
            <div class="container">
                <h1>Header Resize On Scroll with Animations</h1>
                <p>Cupcake ipsum dolor sit amet lollipop. Macaroon candy cotton candy bear claw macaroon carrot cake pastry icing dessert. Cupcake pastry tart sesame snaps lollipop donut pie. Cookie apple pie toffee lemon drops jelly beans cheesecake sweet roll. Jelly-o soufflé donut candy canes wafer dragée sweet cheesecake. Macaroon caramels pie cookie gummi bears. Ice cream jelly-o toffee cookie gingerbread cookie. Soufflé fruitcake jelly-o jelly chupa chups jelly beans. Dragée marzipan pastry macaroon oat cake muffin soufflé topping liquorice. Jelly-o chocolate cake lollipop.</p>
                <p>Sugar plum muffin cookie pastry oat cake icing candy canes chocolate. Gummi bears chupa chups fruitcake dessert jelly. Muffin cookie ice cream soufflé pastry lollipop gingerbread sweet. Unerdwear.com bonbon candy marzipan bonbon gummies chocolate cake gummi bears powder. Unerdwear.com tart halvah chocolate cake dragée liquorice. Sugar plum chocolate bar pastry liquorice dragée jelly powder. Jelly tootsie roll applicake caramels. Marzipan candy tootsie roll donut. Gummies ice cream macaroon applicake.</p>
                <p>
                    <a href="http://www.callmenick.com/tutorials/create-an-animated-resizing-header-on-scroll">&laquo; Go back to this tutorial?</a><br>
                    <a href="http://www.callmenick.com/tutorials">&laquo; Go back to all tutorials?</a>
                </p>
            </div>
        </section>
        <section class="color">
            <div class="container">
                <h1>Cupcakes for the people!</h1>
                <p>Cupcake ipsum dolor sit amet lollipop. Macaroon candy cotton candy bear claw macaroon carrot cake pastry icing dessert. Cupcake pastry tart sesame snaps lollipop donut pie. Cookie apple pie toffee lemon drops jelly beans cheesecake sweet roll. Jelly-o soufflé donut candy canes wafer dragée sweet cheesecake. Macaroon caramels pie cookie gummi bears. Ice cream jelly-o toffee cookie gingerbread cookie. Soufflé fruitcake jelly-o jelly chupa chups jelly beans. Dragée marzipan pastry macaroon oat cake muffin soufflé topping liquorice. Jelly-o chocolate cake lollipop.</p>
                <p>Sugar plum muffin cookie pastry oat cake icing candy canes chocolate. Gummi bears chupa chups fruitcake dessert jelly. Muffin cookie ice cream soufflé pastry lollipop gingerbread sweet. Unerdwear.com bonbon candy marzipan bonbon gummies chocolate cake gummi bears powder. Unerdwear.com tart halvah chocolate cake dragée liquorice. Sugar plum chocolate bar pastry liquorice dragée jelly powder. Jelly tootsie roll applicake caramels. Marzipan candy tootsie roll donut. Gummies ice cream macaroon applicake.</p>
            </div>
        </section>
        <section>
            <div class="container">
                <h1>Chocolate, vanilla, and red velvet</h1>
                <p>Cupcake ipsum dolor sit amet lollipop. Macaroon candy cotton candy bear claw macaroon carrot cake pastry icing dessert. Cupcake pastry tart sesame snaps lollipop donut pie. Cookie apple pie toffee lemon drops jelly beans cheesecake sweet roll. Jelly-o soufflé donut candy canes wafer dragée sweet cheesecake. Macaroon caramels pie cookie gummi bears. Ice cream jelly-o toffee cookie gingerbread cookie. Soufflé fruitcake jelly-o jelly chupa chups jelly beans. Dragée marzipan pastry macaroon oat cake muffin soufflé topping liquorice. Jelly-o chocolate cake lollipop.</p>
                <p>Sugar plum muffin cookie pastry oat cake icing candy canes chocolate. Gummi bears chupa chups fruitcake dessert jelly. Muffin cookie ice cream soufflé pastry lollipop gingerbread sweet. Unerdwear.com bonbon candy marzipan bonbon gummies chocolate cake gummi bears powder. Unerdwear.com tart halvah chocolate cake dragée liquorice. Sugar plum chocolate bar pastry liquorice dragée jelly powder. Jelly tootsie roll applicake caramels. Marzipan candy tootsie roll donut. Gummies ice cream macaroon applicake.</p>
            </div>
        </section>
        <section class="color">
            <div class="container">
                <h1>Come to me!</h1>
                <p>Cupcake ipsum dolor sit amet lollipop. Macaroon candy cotton candy bear claw macaroon carrot cake pastry icing dessert. Cupcake pastry tart sesame snaps lollipop donut pie. Cookie apple pie toffee lemon drops jelly beans cheesecake sweet roll. Jelly-o soufflé donut candy canes wafer dragée sweet cheesecake. Macaroon caramels pie cookie gummi bears. Ice cream jelly-o toffee cookie gingerbread cookie. Soufflé fruitcake jelly-o jelly chupa chups jelly beans. Dragée marzipan pastry macaroon oat cake muffin soufflé topping liquorice. Jelly-o chocolate cake lollipop.</p>
                <p>Sugar plum muffin cookie pastry oat cake icing candy canes chocolate. Gummi bears chupa chups fruitcake dessert jelly. Muffin cookie ice cream soufflé pastry lollipop gingerbread sweet. Unerdwear.com bonbon candy marzipan bonbon gummies chocolate cake gummi bears powder. Unerdwear.com tart halvah chocolate cake dragée liquorice. Sugar plum chocolate bar pastry liquorice dragée jelly powder. Jelly tootsie roll applicake caramels. Marzipan candy tootsie roll donut. Gummies ice cream macaroon applicake.</p>
            </div>
        </section>
        <section>
            <div class="container">
                <h1>Sugar rush, oh my...</h1>
                <p>Cupcake ipsum dolor sit amet lollipop. Macaroon candy cotton candy bear claw macaroon carrot cake pastry icing dessert. Cupcake pastry tart sesame snaps lollipop donut pie. Cookie apple pie toffee lemon drops jelly beans cheesecake sweet roll. Jelly-o soufflé donut candy canes wafer dragée sweet cheesecake. Macaroon caramels pie cookie gummi bears. Ice cream jelly-o toffee cookie gingerbread cookie. Soufflé fruitcake jelly-o jelly chupa chups jelly beans. Dragée marzipan pastry macaroon oat cake muffin soufflé topping liquorice. Jelly-o chocolate cake lollipop.</p>
                <p>Sugar plum muffin cookie pastry oat cake icing candy canes chocolate. Gummi bears chupa chups fruitcake dessert jelly. Muffin cookie ice cream soufflé pastry lollipop gingerbread sweet. Unerdwear.com bonbon candy marzipan bonbon gummies chocolate cake gummi bears powder. Unerdwear.com tart halvah chocolate cake dragée liquorice. Sugar plum chocolate bar pastry liquorice dragée jelly powder. Jelly tootsie roll applicake caramels. Marzipan candy tootsie roll donut. Gummies ice cream macaroon applicake.</p>
            </div>
        </section>
    </div>
</div><!-- #main -->


<footer>
<div id="info-bar">
    <div class="container clearfix">
        <span class="all-tutorials"><a href="http://www.callmenick.com/tutorials">&larr; all tutorials</a></span>
        <span class="back-to-tutorial"><a href="http://www.callmenick.com/tutorials/create-an-animated-resizing-header-on-scroll">back to the tutorial</a></span>
    </div>
</div><!-- /#top-bar -->
</footer><!-- /footer -->



</div><!-- /#wrapper -->


</body>
</html>

CSS

/* =Reset default browser CSS. Based on work by Eric Meyer: http://meyerweb.com/eric/tools/css/reset/index.html
-------------------------------------------------------------- */
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, font, 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 {
  background: transparent;
  border: 0;
  margin: 0;
  padding: 0;
  vertical-align: baseline; }

body {
  line-height: 1; }

h1, h2, h3, h4, h5, h6 {
  clear: both;
  font-weight: normal; }

ol, ul {
  list-style: none; }

blockquote {
  quotes: none; }

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

del {
  text-decoration: line-through; }

/* tables still need 'cellspacing="0"' in the markup */
table {
  border-collapse: collapse;
  border-spacing: 0; }

a img {
  border: none; }

/* =Scss Variables
-------------------------------------------------------------- */
/* =Global
-------------------------------------------------------------- */
*,
*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box; }

body {
  background-color: #3cb5f9;
  color: #505050;
  font-family: "Ubuntu", sans-serif;
  font-weight: 300;
  font-size: 16px;
  line-height: 1.8; }

/* Headings */
h1, h2, h3, h4, h5, h6 {
  line-height: 1;
  font-weight: 300; }

a {
  text-decoration: none;
  color: #3cb5f9; }

a:hover {
  color: #0793e2; }

/* =Template
-------------------------------------------------------------- */
#wrapper {
  width: 100%;
  margin: 0 auto; }

#main {
  background-color: #fff;
  padding-top: 150px; }

.container {
  width: 80%;
  margin: 0 auto;
  padding: 0 30px; }

section {
  padding: 60px 0; }
  section h1 {
    font-weight: 700;
    margin-bottom: 10px; }
  section p {
    margin-bottom: 30px; }
    section p:last-child {
      margin-bottom: 0; }
  section.color {
    background-color: #3cb5f9;
    color: white; }

/* =Info Bar
-------------------------------------------------------------- */
#info-bar {
  background-color: #3cb5f9; }
  #info-bar a {
    color: white;
    font-size: 14px;
    text-transform: uppercase;
    display: inline-block;
    margin: 0;
    padding: 10px; }
    #info-bar a:hover {
      background-color: #0793e2; }
  #info-bar span.all-tutorials,
  #info-bar span.back-to-tutorial {
    display: block;
    width: 50%; }
  #info-bar span.all-tutorials {
    float: left;
    text-align: left; }
  #info-bar span.back-to-tutorial {
    float: right;
    text-align: right; }

/* =Header
-------------------------------------------------------------- */
header {
  width: 100%;
  height: 150px;
  overflow: hidden;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  background-color: #0683c9;
  -webkit-transition: height 0.3s;
  -moz-transition: height 0.3s;
  -ms-transition: height 0.3s;
  -o-transition: height 0.3s;
  transition: height 0.3s; }
  header h1#logo {
    display: inline-block;
    height: 150px;
    line-height: 150px;
    float: left;
    font-family: "Oswald", sans-serif;
    font-size: 60px;
    color: white;
    font-weight: 400;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s; }
  header nav {
    display: inline-block;
    float: right; }
    header nav a {
      line-height: 150px;
      margin-left: 20px;
      color: #9fdbfc;
      font-weight: 700;
      font-size: 18px;
      -webkit-transition: all 0.3s;
      -moz-transition: all 0.3s;
      -ms-transition: all 0.3s;
      -o-transition: all 0.3s;
      transition: all 0.3s; }
      header nav a:hover {
        color: white; }
  header.smaller {
    height: 75px; }
    header.smaller h1#logo {
      width: 150px;
      height: 75px;
      line-height: 75px;
      font-size: 30px; }
    header.smaller nav a {
      line-height: 75px; }

/* =Footer
-------------------------------------------------------------- */
/* =Extras
-------------------------------------------------------------- */
.clearfix:after {
  visibility: hidden;
  display: block;
  content: "";
  clear: both;
  height: 0; }

/* =Media Queries
-------------------------------------------------------------- */
@media all and (max-width: 660px) {
  /* =Header
  -------------------------------------------------------------- */
  header h1#logo {
    display: block;
    float: none;
    margin: 0 auto;
    height: 100px;
    line-height: 100px;
    text-align: center; }
  header nav {
    display: block;
    float: none;
    height: 50px;
    text-align: center;
    margin: 0 auto; }
    header nav a {
      line-height: 50px;
      margin: 0 10px; }
  header.smaller {
    height: 75px; }
    header.smaller h1#logo {
      height: 40px;
      line-height: 40px;
      font-size: 30px; }
    header.smaller nav {
      height: 35px; }
      header.smaller nav a {
        line-height: 35px; } }
@media all and (max-width: 600px) {
  .container {
    width: 100%; }

  #info-bar a {
    display: block; }
  #info-bar span.all-tutorials,
  #info-bar span.back-to-tutorial {
    width: 100%; }
  #info-bar span.all-tutorials,
  #info-bar span.back-to-tutorial {
    float: none;
    text-align: center; }
  #info-bar span.all-tutorials {
    border-bottom: solid 1px #0793e2; } }

/*!
 * classie v1.0.0
 * class helper functions
 * from bonzo https://github.com/ded/bonzo
 * MIT license
 * 
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */

/*jshint browser: true, strict: true, undef: true, unused: true */
/*global define: false */

( function( window ) {

'use strict';

// class helper functions from bonzo https://github.com/ded/bonzo

function classReg( className ) {
  return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
}

// classList support for class management
// altho to be fair, the api sucks because it won't accept multiple classes at once
var hasClass, addClass, removeClass;

if ( 'classList' in document.documentElement ) {
  hasClass = function( elem, c ) {
    return elem.classList.contains( c );
  };
  addClass = function( elem, c ) {
    elem.classList.add( c );
  };
  removeClass = function( elem, c ) {
    elem.classList.remove( c );
  };
}
else {
  hasClass = function( elem, c ) {
    return classReg( c ).test( elem.className );
  };
  addClass = function( elem, c ) {
    if ( !hasClass( elem, c ) ) {
      elem.className = elem.className + ' ' + c;
    }
  };
  removeClass = function( elem, c ) {
    elem.className = elem.className.replace( classReg( c ), ' ' );
  };
}

function toggleClass( elem, c ) {
  var fn = hasClass( elem, c ) ? removeClass : addClass;
  fn( elem, c );
}

var classie = {
  // full names
  hasClass: hasClass,
  addClass: addClass,
  removeClass: removeClass,
  toggleClass: toggleClass,
  // short names
  has: hasClass,
  add: addClass,
  remove: removeClass,
  toggle: toggleClass
};

// transport
if ( typeof define === 'function' && define.amd ) {
  // AMD
  define( classie );
} else {
  // browser global
  window.classie = classie;
}

})( window );

最佳答案

只需将此 CSS 规则添加到您的 Logo 图像中:

#logo img {height: 100%;}

在这里查看:http://codepen.io/anon/pen/GNJgJj

关于javascript - 如何让图像在滚动时调整大小？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40469873/

javascript - 如何让图像在滚动时调整大小？

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