html - HTML 中的图标未显示在网页上？

Question

我试图让一个图标或 .png 显示在我网站登录框中文本“用户名”的右侧，但我无法让它显示出来。我练习制作一个简单的 html 页面，我可以让它出现在一个简单页面的屏幕上，但是当我在我的登录页面上尝试时，不能让它出现在“用户名”旁边。我尝试将 .png 和 .ico 的代码放在“用户名”旁边和我的 .css 文件中关联的标题下，但无法让它出现。 .png 和 .ico 文件位于根文件夹中。我阅读并观看了许多教程，尝试了许多不同的代码示例等。如有任何建议，我们将不胜感激!

我试过放置这段代码但没有成功:

<img src = 'sunny.png' style='vertical-align: middle' />

我的登录html代码:

$(document).ready(function () {
        	$('#logo').addClass('animated fadeInDown');
        	$("input:text:visible:first").focus();
    	});
    	$('#username').focus(function() {
    		$('label[for="username"]').addClass('selected');
    	});
    	$('#username').blur(function() {
    		$('label[for="username"]').removeClass('selected');
    	});
    	$('#password').focus(function() {
    		$('label[for="password"]').addClass('selected');
    	});
    	$('#password').blur(function() {
    		$('label[for="password"]').removeClass('selected');
    	});

body {
    	background: url("../images/photo_bg.jpg") no-repeat center center fixed;
    	background-size: cover;
    	font-size: 16px;
    	font-family: 'Lato', sans-serif;
    	font-weight: 300;
    	margin: 0;
    	color: #666;
    }

    /* Typography */
    h1#title {
    	font-family: 'Roboto Slab', serif;
    	font-weight: 300;
    	font-size: 3.2em;
    	color: white;
    	text-shadow: 0 0 10px rgba(0,0,0,0.8);
    	margin: 0 auto;
    	padding-top: 180px;
    	max-width: 300px;
    	text-align: center;
    	position: relative;
    	top: 0px;
    }

    h1#title span span {
    	font-weight: 400;
    }

    h2 {
    	<img style='vertical-align:middle;' src='gmail.png' width="30">
    <div style='vertical-align:middle; display:inline;'>
    Your text here
    </div>
    	text-transform: uppercase;
    	color: white;
    	font-weight: 400;
    	letter-spacing: 1px;
    	font-size: 1.4em;
    	line-height: 2.8em;
    }

    a {
    	text-decoration: none;
    	color: #666;
    }

    a:hover {
    	color: #aeaeae;
    }

    p.small {
    	font-size: 0.8em;
    	margin: 20px 0 0;
    }


    /* Layout */
    .container {
    	margin: 0;
    }

    .top {
    	margin: 0;
    	padding: 0;
    	width: 100%;
    	background: -moz-linear-gradient(top,  rgba(0,0,0,0.6) 0%, rgba(0,0,0,0) 100%); /* FF3.6-15 */
    	background: -webkit-linear-gradient(top,  rgba(0,0,0,0.6) 0%,rgba(0,0,0,0) 100%); /* Chrome10-25,Safari5.1-6 */
    	background: linear-gradient(to bottom,  rgba(0,0,0,0.6) 0%,rgba(0,0,0,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#99000000', endColorstr='#00000000',GradientType=0 ); /* IE6-9 */
    }

    .login-box {
    	background-color: white;
    	max-width: 340px;
    	margin: 0 auto;
    	position: relative;
    	top: 80px;
    	padding-bottom: 30px;
    	border-radius: 5px;
    	box-shadow: 0 5px 50px rgba(0,0,0,0.4);
    	text-align: center;
    }

    .login-box .box-header {
    	background-color: #665851;
    	margin-top: 0;
    	border-radius: 5px 5px 0 0;
    }

    .login-box label {
    	font-weight: 700;
    	font-size: .8em;
    	color: #888;
    	letter-spacing: 1px;
    	text-transform: uppercase;
    	line-height: 2em;
    }

    .login-box input {
    	margin-bottom: 20px;
    	padding: 8px;
    	border: 1px solid #ccc;
    	border-radius: 2px;
    	font-size: .9em;
    	color: #888;
    }

    .login-box input:focus {
    	outline: none;
    	border-color: #665851;
    	transition: 0.5s;
    	color: #665851;
    }

    .login-box button {
    	margin-top: 0px;
    	border: 0;
    	border-radius: 2px;
    	color: white;
    	padding: 10px;
    	text-transform: uppercase;
    	font-weight: 400;
    	font-size: 0.7em;
    	letter-spacing: 1px;
    	background-color: #665851;
    	cursor:pointer;
    	outline: none;
    }

    .login-box button:hover {
    	opacity: 0.7;
    	transition: 0.5s;
    }

    .login-box button:hover {
    	opacity: 0.7;
    	transition: 0.5s;
    }

    .selected {
    	color: #665851!important;
    	transition: 0.5s;
    }

    /* Animation Delay */
    #logo {
      -webkit-animation-duration: 1s;
      -webkit-animation-delay: 2s;
    }

    .login-box {
      -webkit-animation-duration: 1s;
      -webkit-animation-delay: 1s;
    }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<body>
    	<div class="container">
    		<div class="top">
    			<h1 id="title" class="hidden"><span id="logo">Daily <span>UI</span></span></h1>
    		</div>
    		<div class="login-box animated fadeInUp">
    			<div class="box-header">
    				<h2>Log In</h2>
    			</div>
    			<label for="username">Username</label>
    			<br/>
    			<input type="text" id="username">
    			<br/>
    			<label for="password">Password</label>
    			<br/>
    			<input type="password" id="password">
    			<br/>
    			<button type="submit">Sign In</button>
    			<br/>
    			<a href="#"><p class="small">Forgot your password?</p></a>
    		</div>
    	</div>
    </body>

Answer 1

尝试添加:

Font Awesome CSS URI

CheatSheet : placeholder=" 用户名"

和输入{ font-family: 'FontAwesome'; 到你的 css

$(document).ready(function () {
        	$('#logo').addClass('animated fadeInDown');
        	$("input:text:visible:first").focus();
    	});
    	$('#username').focus(function() {
    		$('label[for="username"]').addClass('selected');
    	});
    	$('#username').blur(function() {
    		$('label[for="username"]').removeClass('selected');
    	});
    	$('#password').focus(function() {
    		$('label[for="password"]').addClass('selected');
    	});
    	$('#password').blur(function() {
    		$('label[for="password"]').removeClass('selected');
    	});

body {
    	background: url("../images/photo_bg.jpg") no-repeat center center fixed;
    	background-size: cover;
    	font-size: 16px;
    	font-family: 'Lato', sans-serif;
    	font-weight: 300;
    	margin: 0;
    	color: #666;
    }

    /* Typography */
    h1#title {
    	font-family: 'Roboto Slab', serif;
    	font-weight: 300;
    	font-size: 3.2em;
    	color: white;
    	text-shadow: 0 0 10px rgba(0,0,0,0.8);
    	margin: 0 auto;
    	padding-top: 180px;
    	max-width: 300px;
    	text-align: center;
    	position: relative;
    	top: 0px;
    }

    h1#title span span {
    	font-weight: 400;
    }

    h2 {
    	<img style='vertical-align:middle;' src='gmail.png' width="30">
    <div style='vertical-align:middle; display:inline;'>
    Your text here
    </div>
    	text-transform: uppercase;
    	color: white;
    	font-weight: 400;
    	letter-spacing: 1px;
    	font-size: 1.4em;
    	line-height: 2.8em;
    }

    a {
    	text-decoration: none;
    	color: #666;
    }

    a:hover {
    	color: #aeaeae;
    }

    p.small {
    	font-size: 0.8em;
    	margin: 20px 0 0;
    }


    /* Layout */
    .container {
    	margin: 0;
    }

    .top {
    	margin: 0;
    	padding: 0;
    	width: 100%;
    	background: -moz-linear-gradient(top,  rgba(0,0,0,0.6) 0%, rgba(0,0,0,0) 100%); /* FF3.6-15 */
    	background: -webkit-linear-gradient(top,  rgba(0,0,0,0.6) 0%,rgba(0,0,0,0) 100%); /* Chrome10-25,Safari5.1-6 */
    	background: linear-gradient(to bottom,  rgba(0,0,0,0.6) 0%,rgba(0,0,0,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#99000000', endColorstr='#00000000',GradientType=0 ); /* IE6-9 */
    }

    .login-box {
    	background-color: white;
    	max-width: 340px;
    	margin: 0 auto;
    	position: relative;
    	top: 80px;
    	padding-bottom: 30px;
    	border-radius: 5px;
    	box-shadow: 0 5px 50px rgba(0,0,0,0.4);
    	text-align: center;
    }

    .login-box .box-header {
    	background-color: #665851;
    	margin-top: 0;
    	border-radius: 5px 5px 0 0;
    }

    .login-box label {
    	font-weight: 700;
    	font-size: .8em;
    	color: #888;
    	letter-spacing: 1px;
    	text-transform: uppercase;
    	line-height: 2em;
    }
    
    input { font-family: 'FontAwesome'; /* This is for the placeholder */
    
    .login-box input {
    	margin-bottom: 20px;
    	padding: 8px;
    	border: 1px solid #ccc;
    	border-radius: 2px;
    	font-size: .9em;
    	color: #888;
    }

    .login-box input:focus {
    	outline: none;
    	border-color: #665851;
    	transition: 0.5s;
    	color: #665851;
    }

    .login-box button {
    	margin-top: 0px;
    	border: 0;
    	border-radius: 2px;
    	color: white;
    	padding: 10px;
    	text-transform: uppercase;
    	font-weight: 400;
    	font-size: 0.7em;
    	letter-spacing: 1px;
    	background-color: #665851;
    	cursor:pointer;
    	outline: none;
    }

    .login-box button:hover {
    	opacity: 0.7;
    	transition: 0.5s;
    }

    .login-box button:hover {
    	opacity: 0.7;
    	transition: 0.5s;
    }

    .selected {
    	color: #665851!important;
    	transition: 0.5s;
    }

    /* Animation Delay */
    #logo {
      -webkit-animation-duration: 1s;
      -webkit-animation-delay: 2s;
    }

    .login-box {
      -webkit-animation-duration: 1s;
      -webkit-animation-delay: 1s;
    }

<link href="https://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<body>
    	<div class="container">
    		<div class="top">
    			<h1 id="title" class="hidden"><span id="logo">Daily <span>UI</span></span></h1>
    		</div>
    		<div class="login-box animated fadeInUp">
    			<div class="box-header">
    				<h2>Log In</h2>
    			</div>
    			<label for="username">Username</label>
    			<br/>
    			<input type="text" id="username" placeholder="&#61447; Username">
    			<br/>
    			<label for="password">Password</label>
    			<br/>
    			<input type="password" id="password" placeholder="&#xf084; Password">
    			<br/>
    			<button type="submit">Sign In</button>
    			<br/>
    			<a href="#"><p class="small">Forgot your password?</p></a>
    		</div>
    	</div>
    </body>