Question

我有This Fiddle，因为此演示中的标题有过渡效果我想添加图像作为标题背面我试过这个

CSS

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;
}

* {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  background-color: #ecf0f1;
  font-family: helvetica, arial, sans-serif;
  font-size: 16px;
  padding-top: 330px;
  -moz-transition: padding-top 0.5s ease;
  -o-transition: padding-top 0.5s ease;
  -webkit-transition: padding-top 0.5s ease;
  transition: padding-top 0.5s ease;
}

header {
  width: 100%;
  height: 300px;
  background-color: #3498db;
  background: url("http://eridem.net/wp-content/uploads/2014/06/android-wallpaper.jpg") repeat-x width 100% height 300px position absolute; /**Here Im addig image/
  text-align: center;
  position: relative;
  position: fixed;
  top: 0;
  overflow: hidden;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  -webkit-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
header h1 {
  font-size: 42px;
  color: #fff;
  line-height: 230px;
  text-transform: uppercase;
  font-weight: 100;
  -moz-transition: all 0.6s ease;
  -o-transition: all 0.6s ease;
  -webkit-transition: all 0.6s ease;
  transition: all 0.6s ease;
}

img {
    background-repeat: repeat-x;
    width: 100px;
    height: 20px;
    position: absolute;
    -moz-transition: all 0.6s ease;
  -o-transition: all 0.6s ease;
  -webkit-transition: all 0.6s ease;
  transition: all 0.6s ease;
 }

header nav {
  position: absolute;
  bottom: 0;
  height: 60px;
  line-height: 60px;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.1);
}
header nav a {
  color: #fff;
  display: inline-block;
  padding: 10px 15px;
  line-height: 1;
  text-decoration: none;
  -moz-border-radius: 2px;
  -webkit-border-radius: 2px;
  border-radius: 2px;
}
header nav a:hover {
  -moz-box-shadow: 0 0 0 1px #fff;
  -webkit-box-shadow: 0 0 0 1px #fff;
  box-shadow: 0 0 0 1px #fff;
}

h2 {
  font-size: 34px;
  text-transform: uppercase;
  font-weight: 100;
  line-height: 2;
  color: #2c3e50;
}

p {
  margin-bottom: 2rem;
  line-height: 2;
  color: #7f8c8d;
}

.wrapper {
  width: 800px;
  margin: 0 auto;
}

section {
  padding: 20px;
  margin-bottom: 40px;
  background-color: #fff;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
  -moz-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
}

/* Sticky Header Style */
/* ---------------------------------------- */
body.sticky-header {
  padding-top: 100px;
}
body.sticky-header header {
  height: 60px;
  background-color: rgba(52, 152, 219, 0.9);
}
body.sticky-header header h1 {
  -moz-transform: scale(0, 0);
  -ms-transform: scale(0, 0);
  -webkit-transform: scale(0, 0);
  transform: scale(0, 0);
}

js

$(function(){
  $(window).scroll(function(){
    var winTop = $(window).scrollTop();
    if(winTop >= 30){
      $("body").addClass("sticky-header");
    }else{
      $("body").removeClass("sticky-header");
    }//if-else
  });//win func.
});//ready func.

和html是

<body>

  <header>
    <h1>Header </h1>
    <nav>
      <a href="">Home</a>
    </nav>
  </header>
  <div class="wrapper">
    <section>
      <h2> This is somestuff</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Harum enim sunt delectus, reiciendis omnis laudantium animi, et nulla quidem, aliquam aliquid. A consectetur deleniti voluptates eius neque, voluptate voluptatibus nostrum! Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex libero cupiditate deserunt earum, fuga, ab labore esse animi, nihil est tenetur non delectus perferendis. Maxime accusamus ea rem sint at!</p>
    </section>

如你所知，我是前端网络技术的新手，也是SO的新手。

Answer 1

您错误地编写了背景属性，因为您不需要定义宽度，高度和位置。

background: url("http://eridem.net/wp-content/uploads/2014/06/android-wallpaper.jpg");
background-size:cover;

我添加了背景尺寸：封面，以适应始终图像到背景。

无法使用css向img添加转场

1 个答案: