DOM操作

JS

1.利用js获取select所选择的选项

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<select id="year-select" class="weui-select" name="yearSelect">
  <option value="2018">2018年</option>
  <option value="2019">2019年</option>
</select>

html结构如上所示，使用原生js获取select所选择的内容的方法如下所示：

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let yearSelect = document.getElementById("year-select");
let index = yearSelect.selectedIndex;
let choseYear = yearSelect.options[index].value; // select所选择的值

2.获取ul标签中li元素的个数

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let ul = document.getElementById('#ulId');
let length = ul.getElementsByTagName('li').length;