JavaScript simple easing animation function package

Simple easing animation function:

animate(obj, target, time, callback);

Note: The
obj target object, need to add absolute positioning
target : target position
time: animation interval time
callback: callback function

Code:

function animate(obj, target, time, callback) {
    
    
    // 先清除以前的定时器，只保留当前的一个定时器执行
    clearInterval(obj.timer);
    obj.timer = setInterval(function() {
    
    
        // 步长值写到定时器的里面，并设置为整数，缓动效果
        var step = (target - obj.offsetLeft) / 10;
        step = step > 0 ? Math.ceil(step) : Math.floor(step);
        if (obj.offsetLeft == target) {
    
    
            clearInterval(obj.timer);
            // 回调函数写到定时器结束里面
            callback && callback();
        }
        obj.style.left = obj.offsetLeft + step + 'px';
    }, time);
}