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前言

这里不能使用justify-content: center;，因为在小屏幕上，这种方式无法显示最前面的两个tabBar。

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html

<div id="box" class="d_f o_a mt_50 mb_50 ml_20 mr_20">
    <div class="ws_n">tabBar 1</div>
    <div class="ws_n ml_20">tabBar 2</div>
    <div class="ws_n ml_20">tabBar 3</div>
    <div class="ws_n ml_20">tabBar 4</div>
    <div class="ws_n ml_20">tabBar 5</div>
    <div class="ws_n ml_20">tabBar 6</div>
    <div class="ws_n ml_20">tabBar 7</div>
    <div class="ws_n ml_20">tabBar 8</div>
    <div class="ws_n ml_20">tabBar 9</div>
</div>

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style

#box {
    & :first-child {
        margin-left: auto;
    }

    & :last-child {
        margin-right: auto;
    }
}

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效果

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