js获取元素的name属性

<input type="text" id="myInput" name="username">
<script>
    var element = document.getElementById('myInput');
    console.log(element.name); // 输出: username
</script>

<div id="formContainer">
    <input type="text" name="email">
</div>
<script>
    var element = document.querySelector('#formContainer input');
    console.log(element.name); // 输出: email
</script>

<input type="text" name="user">
<input type="text" name="user">
<script>
    var elements = document.getElementsByName('user');
    for(var i = 0; i < elements.length; i++) {
        console.log(elements[i].name); // 输出: user 多次
    }
</script>

window.onload = function() {
    var element = document.getElementById('myInput');
    console.log(element.name);
};