彈性盒子用於頁面布局。
之前面試經常會問到：寫乙個三列布局，左右兩個定寬，中間的寬度自動伸縮門。
解決方法有很多種，可以設定三列浮動，左右定寬，中間寬度自動。
下面要說的是一種利用css布局來結局的比較好的方案。
使用box-flex屬性告訴瀏覽器如何分配元素之間的未使用的空間。
看個例子：
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
上述例子中就實現了要求中的布局。
這裡使用了彈性應用盒屬性。
父元素屬性設定display:box;子元素中，想要自動伸縮的盒子屬性設定box-flex,瀏覽器會分配定寬的元素，然後將剩下的空間按比例分配給伸縮的元素。
上述例子中修改：
.left
.mindle
可以發現，左邊元素和中間元素的比例為3：1，而且改變瀏覽器寬度，二者始終保持3：1。
這是最簡單的彈性布局，除此之外，彈性盒子還可以完成很多方向的布局：
比如子元素的高度比父元素的小，這樣設定資源的box-align來保持垂直高度的分配。
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
start 元素沿容器頂邊放置，任何空間都在其下方顯示。
end元素沿容器底邊放置，任何空間都在其上方顯示。
center對於控制項北平分為兩部分，分別顯示在元素的上方和下方。
strech調整元素高度，已填充可用空間。
也可以為元素設定最大寬度，當元素達到最大寬度時，剩餘的空間自動分配。
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;this is a div;
box-pack屬性的值：
start：元素從左邊界開始放置，任何未分配的控制項顯示到最後乙個元素的右邊。
end：元素從右邊界開始放置，任何未分配的控制項顯示到最後乙個元素的左邊。
center：多餘空間分配到第乙個與阿奴的左邊和最後乙個元素的右邊。
justify：多餘空間均勻分配到各個元素之間。
目前沒有瀏覽器支援 box-flex 屬性。
firefox 支援替代的 -moz-box-flex 屬性。
safari、opera 以及 chrome 支援替代的 -webkit-box-flex 屬性。
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