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為什么我的“慕課網”三個字右邊間距沒有原代碼大？

<!DOCTYPE?HTML><html><head><meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"><title>帶表單的導航條</title><link?rel="stylesheet"?></head><body><!--代碼-->
<div?class="navbar?navbar-default">????
<div?class="navbar-header">????????
<a?href="##"?class="navbar-brand">慕課網</a>
????</div>
????????<ul?class="nav?navbar-nav">
????????????????<li?class="active"><a?href="#">網站首頁</a></li>
????????????????????????<li?class="dropdown">
????????????????????????????????????<a?href="#"?class="dropdown-toggle"?data-toggle="dropdown">名師介紹<span?class="caret"></span></a>????????????<ul?class="dropdown-menu">????????????????<li><a?href="#">a</a></li>????????????????<li><a?href="#">a</a></li>????????????????<li?class="disabled"><a?href="#">a</a></li>????????????</ul>????????</li>????????<li><a?href="#">成功案例</a></li>????????<li><a?href="#">成功案例</a></li>????????<li><a?href="#">關于我們</a></li>????</ul>????<form?class="navbar-form?navbar-right">????????<div?class="form-group">????????????<input?type="text"?class="form-control"?placeholder="請輸入關鍵詞">????????</div>????????<button?type="submit"?class="btn?btn-default">搜索</button>????</form></div><div?class="navbar?navbar-default"?role="navigation">??　<div?class="navbar-header">??　????<a?href="##"?class="navbar-brand">慕課網</a>??　</div>????<ul?class="nav?navbar-nav">???????<li?class="active"><a?href="##">網站首頁</a></li>???????<li?class="dropdown">??????????<a?href="##"?data-toggle="dropdown"?class="dropdown-toggle">系列教程<span?class="caret"></span></a>??????????<ul?class="dropdown-menu">????????	<li><a?href="##">CSS3</a></li>????????	<li><a?href="##">JavaScript</a></li>????????	<li?class="disabled"><a?href="##">PHP</a></li>??????????</ul>??????</li>??????<li><a?href="##">名師介紹</a></li>??????<li><a?href="##">成功案例</a></li>??????<li><a?href="##">關于我們</a></li>	</ul>?????<form?action="##"?class="navbar-form?navbar-left"?rol="search">???	????<div?class="form-group">???		???<input?type="text"?class="form-control"?placeholder="請輸入關鍵詞"?/>???	????</div>????????<button?type="submit"?class="btn?btn-default">搜索</button>?????</form></div><script?src="http://www.xianlaiwan.cn/static/lib/jquery/1.9.1/jquery.js"></script><script?src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>?</body></html>