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我的滑块有问题。例如，当我有 2 个大台阶并且我的滑块长度超过 1000 像素时，我必须将手柄拉到 500 像素以上才能跳到第二个点。但是当我做这个手柄时不要在 500px 之前移动 :( 如何让手跟随光标？