<div class="right">
    <label for="1">
        <input type="radio" name="radio" value="1">1
    </label>
    <label for="2">
        <input type="radio" name="radio" value="2">2
    </label>
    <label for="3">
        <input type="radio" name="radio" value="3">3
    </label>
    <label for="4">
        <input type="radio" name="radio" value="4">4
    </label>
</div>

    // 通过类名获取dom
    let rightNodes = document.getElementsByClassName(‘right‘)
    // 获取元素的所有子节点
    let rightChildNodes = document.getElementsByClassName(‘right‘)[0].childNodes
    // 获取元素的第一层子节点
    let labelNodes = document.getElementsByClassName(‘right‘)[0].children
    // 通过name属性获取节点
    let nameNodes = document.getElementsByName("radio")

    $(function(){
        console.info(‘1‘,  $(‘.right input‘))
    })