js获取checkbox的状态

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

// JavaScript
var checkbox = document.getElementById('myCheckbox');
if (checkbox.checked) {
    console.log('Checkbox is checked.');
} else {
    console.log('Checkbox is not checked.');
}

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

// JavaScript
document.getElementById('myCheckbox').addEventListener('change', function() {
    if (this.checked) {
        console.log('Checkbox is checked.');
    } else {
        console.log('Checkbox is not checked.');
    }
});

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

// 使用对象存储状态
var checkboxStates = {};

document.querySelectorAll('input[type="checkbox"]').forEach(function(checkbox) {
    checkboxStates[checkbox.id] = checkbox.checked;
});

console.log(checkboxStates);