你可以这样使用css:

overflow-y: scroll;
overflow-x: hidden;

<div style="width:100px;height:100px;overflow-x:hidden;overflow-y:auto;background-color:#000000">

你可以这样使用css:

overflow-y: scroll;
overflow-x: hidden;

通过添加以下代码，完全禁用水平滚动条。

body{
  overflow-x: hidden;
  overflow-y: scroll;
}

selector{
 overflow-y: scroll;
 overflow-x: hidden;
}

带有snippet和jsfiddle的工作示例link https://jsfiddle.net/sx8u82xp/3/

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.combobox_selector ul {
    padding: 0;
    margin: 0;
    list-style: none;
    border:1px solid #CCC;
    height: 200px;
    overflow: auto;
    overflow-x: hidden;
}

设置200px向下滚动大小，溢出x隐藏任何水平滚动条。