js 判断input是否有属性

let inputElement = document.getElementById('myInput');
if (inputElement.hasAttribute('disabled')) {
    console.log('Input has the "disabled" attribute.');
} else {
    console.log('Input does not have the "disabled" attribute.');
}

let inputElement = document.getElementById('myInput');
if (inputElement.disabled !== undefined) {
    console.log('Input is disabled.');
} else {
    console.log('Input is not disabled.');
}

let inputElement = document.getElementById('myInput');
if (inputElement.getAttribute('disabled') !== null) {
    console.log('Input has the "disabled" attribute.');
} else {
    console.log('Input does not have the "disabled" attribute.');
}

let inputElement = document.getElementById('myInput');
if (inputElement.getAttribute('data-custom') !== null && inputElement.getAttribute('data-custom') !== '') {
    console.log('Input has a valid "data-custom" attribute.');
} else {
    console.log('Input does not have a valid "data-custom" attribute.');
}