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HTML

              
                <p>flex-grow计算</p>
<div class="wrap">
	<div class="item">宽度300</div>
	<div class="item">宽度300</div>
	<div class="item">宽度200</div>
</div>

<p>flex-grow计算2</p>
<div class="wrap">
	<div class="item grow2">宽度266.66</div>
	<div class="item grow3">宽度300</div>
	<div class="item grow1">宽度233.33</div>
</div>

              
            
!

CSS

              
                .wrap
	display flex
	border 4px solid #000
	width 800px
	.item
		width 100px
		height 200px
		flex-basis 200px
		&:nth-child(1)
			background #eee
			flex-grow 1
		&:nth-child(2)
			background red
			flex-grow 1
		&:nth-child(3)
			background yellow
		&.grow2
			flex-grow 2
		&.grow3
			flex-grow 3
		&.grow1
			flex-grow 1
              
            
!

JS

              
                
              
            
!
999px

Console