input 获取焦点

input可以通过两种方式获取焦点。一种是使用HTML属性autofocus，在input标签中增加属性autofocus即可自动获取焦点。例如：
<input id='test' type="text" autofocus="autofocus" />
另一种是使用JavaScript方法focus()，通过获取元素的id并调用focus()方法来实现。例如：
document.getElementById('test').focus();<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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