Установил флажок JS SET
// Check
document.getElementById("checkbox").checked = true;
// Uncheck
document.getElementById("checkbox").checked = false;
kepl3r
// Check
document.getElementById("checkbox").checked = true;
// Uncheck
document.getElementById("checkbox").checked = false;//HTML
<input type="checkbox" id="Numbers">Short Numbers</input>
<button type="button" onClick="changeCheckbox()">Save</button>
//JAVASCRIPT
function changeCheckbox(){
if(value)
document.getElementById("Numbers").checked = true;
}