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容器属性

1. flex-direction：控制布局横向还是纵向（row（默认值）、row-reverse、column、column-reverse）
2. justify-content：控制主轴内容居中，靠左，靠右，平均（flex-start(默认值)，flex-end，center，space-between，space-evenly，space-around）
3. align-items：控制辅轴内容居中，靠上，靠下，平均（normal，stretch【不设置子元素高度时自动拉伸至父元素高度】，flex-satrt，flex-end，center，baseline）
4. flex-wrap：控制主轴内容在一行还是多行（nowrap(默认)，wrap，wrap-reverse）
5. align-content：控制多行内容居中，靠上，靠下，平均（stretch(默认值)，flex-start，flex-end，center，space-between，space-evenly，space-around）
6. flex-flow：flex-direction与flex-wrap的简写（flex-flow: row wrap）

ITEM属性

1. order：（排序，值越小约靠前）
2. align-self：覆盖父元素的align-items值，值与父元素值一致
3. flex-grow： 决定了flex items如何扩展，值为0或者小数（当flex container 在main axis方向上有剩余得size时，flex-grow属性才会有效）
4. flex-shrink：有扩大自然就会有缩小，与上个属性类似
5. flex-basis：在分配多余空间之前，项目占据的主轴空间（main size）
6. flex：flex-grow || flex-shink||flex-basis的简写

筛子布局

<template>
	<div>
		<div id="content">
			<div class="item one">
				<span class="item-one"></span>
			</div>
			<div class="item two">
				<span class="two1"></span>
				<span class="two2"></span>
				<span class="two3"></span>
			</div>
			<div class="item three">
				<div class="three-one">
					<span></span>
					<span></span>
				</div>
				<div class="three-two">
					<span></span>
				</div>
				<div class="three-three">
					<span></span>
					<span></span>
				</div>
			</div>
			<div class="item four">
				<div class="four-one">
					<span></span>
					<span></span>
					<span></span>
				</div>
				<div class="four-two">
					<span></span>
					<span></span>
					<span></span>
				</div>
			</div>
		</div>
	</div>
</template>

<script>
	export default {
		name: 'HelloWorld'
	}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
#content{
	width: 500px;
	height: 500px;
	background: red;
	display: flex;
	justify-content: space-evenly;
	align-items: center;
}
.item{
	width:100px;
	height: 100px;
	background: blue;
}
.one{
	justify-content: center;
	align-items: center;
}
.two{
	justify-content: space-between;
}
.two2{
	align-self: center;
}
.two3{
	align-self: flex-end;
}
.three{
	flex-direction: column;
	justify-content: space-between;
}
.three-one ,.three-three{
	justify-content: space-between;
}
.three-two{
	justify-content: center;
}
.four{
	justify-content: space-evenly;
}
.four-one,.four-two{
	flex-direction: column;
	justify-content: space-between;
}
span{
	width:20px;
	height: 20px;
	border-radius: 50%;
	background: yellow;
}
div{
	display: flex;
}
</style>