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# Flex Basic
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- order: 4
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Flex 布局基础
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使用 `row-flex` 定义 `flex` 布局，其子元素根据不同的值 `start`,`center`,`end`,`space-between`,`space-around`，分别定义其在父节点里面的排版方式。
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---
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````html
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<p>子元素居左排列</p>
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<div class="row-flex row-flex-start">
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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</div>
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<p>子元素居中排列</p>
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<div class="row-flex row-flex-center">
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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</div>
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<p>子元素居右排列</p>
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<div class="row-flex row-flex-end">
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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</div>
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<p>子元素等宽排列</p>
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<div class="row-flex row-flex-space-between">
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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</div>
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<p>子元素分散对齐</p>
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<div class="row-flex row-flex-space-around">
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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<div class="col-4">2</div>
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</div>
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````
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