if checked add unchecked javascript example

Example 1: oncheck checkbox javascript

<input type='checkbox' onchange='handleChange(this);'> Checkbox

function handleChange(checkbox) {
    if(checkbox.checked == true){
        document.getElementById("submit").removeAttribute("disabled");
    }else{
        document.getElementById("submit").setAttribute("disabled", "disabled");
   }
}

Example 2: how to check if input is checked javascript

const cb = document.getElementById('accept');
console.log(cb.checked);