how to implement mousemove while mouseDown pressed js

Use the mousemove event.

From mousemove and mouseover jquery docs:

The mousemove event is sent to an element when the mouse pointer moves inside the element.

The mouseover event is sent to an element when the mouse pointer enters the element.

Example: (check console output)

$(".floor").mousedown(function () {
    $(this).mousemove(function () {
        console.log("OK Moved!");
    });
}).mouseup(function () {
    $(this).unbind('mousemove');
}).mouseout(function () {
    $(this).unbind('mousemove');
});

https://jsfiddle.net/n4820hsh/

In pure javascript, you can achieve this with

function mouseMoveWhilstDown(target, whileMove) {
    var endMove = function () {
        window.removeEventListener('mousemove', whileMove);
        window.removeEventListener('mouseup', endMove);
    };

    target.addEventListener('mousedown', function (event) {
        event.stopPropagation(); // remove if you do want it to propagate ..
        window.addEventListener('mousemove', whileMove);
        window.addEventListener('mouseup', endMove);   
    });
}

Then using the function along the lines of

mouseMoveWhilstDown(
    document.getElementById('move'),
    function (event) { console.log(event); }
);

(nb: in the above example, you don't need the function - you could call it as mouseMoveWhilstDown(document.getElementById('move'), console.log), but you might want to do something with it other than output it to the console!)