js 获取input 选中

// HTML
<input type="checkbox" id="myCheckbox">
<input type="radio" name="myRadioGroup" value="option1">
<input type="radio" name="myRadioGroup" value="option2">

// JavaScript
const checkbox = document.getElementById('myCheckbox');
console.log(checkbox.checked); // 输出: true 或 false

const radioButtons = document.getElementsByName('myRadioGroup');
for (let i = 0; i < radioButtons.length; i++) {
    console.log(radioButtons[i].checked); // 输出: true 或 false
}

// HTML
<input type="checkbox" id="myCheckbox">

// JavaScript
const checkbox = document.getElementById('myCheckbox');
checkbox.addEventListener('change', function() {
    console.log(this.checked); // 输出: true 或 false
});

document.addEventListener('DOMContentLoaded', function() {
    const checkbox = document.getElementById('myCheckbox');
    console.log(checkbox.checked);
});

<input type="radio" name="group1" value="option1">
<input type="radio" name="group1" value="option2">
<input type="radio" name="group2" value="option3">