how make element disabled in js code example

Example 1: javascript disable button

//disable the button
document.getElementById(BUTTON_ID).disabled = true;
//reable the button
document.getElementById(BUTTON_ID).removeAttribute('disabled');

Example 2: javascript getelementbyid disable

//javascript getelementbyid disable
//Enable a button
document.getElementById("Button").disabled=false;

//Disable a button
document.getElementById("Button").disabled=true;