js获取标签的name属性

// HTML
<input type="text" id="myInput" name="username">

// JavaScript
var element = document.getElementById('myInput');
console.log(element.name); // 输出: username

// HTML
<input type="text" class="myClass" name="email">

// JavaScript
var element = document.querySelector('.myClass');
console.log(element.name); // 输出: email

// HTML
<input type="text" name="user">
<input type="text" name="user">

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

// HTML
<input type="text" name="password">
<button name="submit">Submit</button>

// JavaScript
var inputs = document.getElementsByTagName('input');
for (var i = 0; i < inputs.length; i++) {
    console.log(inputs[i].name); // 输出: password
}

var element = document.getElementById('nonExistentElement');
if (element) {
    console.log(element.name);
} else {
    console.log('Element not found');
}

document.addEventListener('DOMContentLoaded', function() {
    var element = document.getElementById('myInput');
    console.log(element.name);
});