問(wèn)題描述

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為什么圖片的高度不會(huì)隨著寬度一起變化？理論效果應(yīng)該如此：

問(wèn)題解答

1 > 是直接后代元素選擇器（子選擇器） 所以第一個(gè)樣式是無(wú)效的；2 正常情況下給圖片設(shè)置寬度，高度會(huì)成比例調(diào)整；3 這種問(wèn)題最好借助http://codepen.io/ ，這樣方便別人排查問(wèn)題。