ThinkPHP_5系统原生标签，变量输出
获取系统变量
{$Think.service.HTTP_HOST}
{$Think.env.PHP_STATUS}
{$Think.session.email}
{$Think.cookie.name}
{$Think.get.id}
{$Think.request.id}
{$Think.post.sid}
{$Think.const.APP_PATH}
{$Think.APP_PATH}
模板变量
[函数运用] 【管道符】
{$email}:{$email|md5}
{$email}:{$email|substr=0,8}
{$email}:{$email|substr=###,0,8}
{$time}:{$time|date="Y-m-d",###}
substr($obj,0,3);
md5($obj);
date('Y-m-d',time());
[计算]
<body>
<h1>这是view/index/index.html</h1>
//Controller由assign()的时候
<p>a+b={$a+$b}</p>
<p>{++$a}</p>
<p>{--$a}</p>
//Controller无assign的时候，可以设默认值
{$email|default="25478@qq.com"}
</body>
[原样输出]【literal标签】
<p>
{literal}
{$email}
{/literal}
</p>
[模板注释]
{/*这里是view的注释*/}
