微信小程序flex弹性布局

微信小程序常用布局为flex。使用flex模型来提高页面布局效率，当页面需要适应不同屏幕大小以及设备类型，该模型一确保元素在恰当的位置。

属性	解释	默认值	其它值
flex-direction	排列方向	row	row-revers、column、column-revers
flex-wrap	是否换行	nowrap	wrap、wrap-reverse
justify-content	主轴方向上的对齐方式	flex-start	flex-end、center、space-between、space-around、space-evenly
align-items	水平方向的对齐方式	stretch	center、flex-end、baseline、flex-start
align-content	多行排列是，行在交叉轴方向上的对齐方式	stretch	flex-start、center、flex-end、space-between、space-around、space-evenly、

<view>页面布局示例</view>
<view style="display: flex;text-align: center;">
    <view style="flex: 1; background-color: red;padding: 20rpx; margin: 10rpx;border-radius: 6rpx;">1</view>
    <view style="flex: 1; background-color: green;padding: 20rpx; margin: 10rpx;border-radius: 6rpx;">2</view>
    <view style="flex: 1; background-color: blue;padding: 20rpx; margin: 10rpx;border-radius: 6rpx;">3</view>
</view>

<!-- <view>colorUI使用</view>
<view class="flex text-center">
    <view class="flex-sub bg-grey padding-sm margin-xs radius">1</view>
    <view class="flex-sub bg-grey padding-sm margin-xs radius">2</view>
    <view class="flex-sub bg-grey padding-sm margin-xs radius">3</view>
</view> -->

<view>左右混合布局</view>
<view style="display: flex;height: 300rpx;text-align: center;">
    <view style="background-color: red;width: 250rpx;line-height: 150rpx;">1</view>
    <view style="display: flex; flex-direction: column;flex-grow: 1;line-height: 150rpx;">
        <view style="background-color: green;flex-grow: 1;">2</view>
        <view style="background-color: blue;flex-grow: 1;">3</view>
    </view>
</view>

<!-- <view>colorUI使用</view>
<view class="flex align-center">
    <view class="bg-grey margin-lr-xs radius" style="padding: 105rpx;">1</view>
    <view class="flex flex-direction flex-sub text-center margin-right-xs">
        <view class="bg-grey padding-lg radius">2</view>
        <view class="bg-grey padding-lg margin-top-xs radius">3</view>
    </view>
</view> -->

<view>上下混合布局</view>
<view style="display: flex; flex-direction: column;line-height: 300rpx;text-align: center;">
    <view style="background-color: red;height: 100rpx;line-height: 100rpx;">1</view>
    <view style="display: flex;flex-direction: row; flex-grow: 1;">
        <view style="background-color: green;flex-grow: 1;">2</view>
        <view style="background-color: blue;flex-grow: 1;">3</view>
    </view>
</view>

<!-- <view>colorUI使用</view>
<view class="flex flex-direction text-center">
    <view class="bg-grey padding margin-xs radius">1</view>
    <view class="flex">
        <view class="flex-sub bg-grey padding-xl margin-xs radius">2</view>
        <view class="flex-sub bg-grey padding-xl margin-xs radius">3</view>
    </view>
</view> -->


<view class="padding-xl"></view>