問題描述

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為什么圖片的高度不會隨著寬度一起變化？理論效果應該如此：

問題解答

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