function move(obj, target, callback) {
clearInterval(obj.timer)
obj.timer = setInterval(function () {
var step = (target - obj.offsetLeft) / 10
step = step > 0 ? Math.ceil(step) : Math.floor(step)
obj.style.left = obj.offsetLeft + step + 'px'
if (obj.offsetLeft == target) {
clearInterval(obj.timer)
if (callback) {
callback()
}
}
}, 10);
}
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