10.px 和 em 的区别 #10
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相同点：px 和 em 都是长度单位
异同点：px 的值是固定的，指定是多少就是多少，计算比较容易。
em 的值不是固定的，并且 em 会继承父级元素的字体大小。
浏览器的默认字体高都是 16px。所以未经调整的浏览器都符合: 1em=16px。
那么 12px=0.75em, 10px=0.625em。
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webVueBlog commentedon Mar 11, 2020
Similarities: px and em are both units of length
Similarities and differences: the value of px is fixed.
The value of em is not fixed, and em inherits the font size of the parent element.
The default font height in the browser is 16px. So all untuned browsers are compliant: 1em=16px.
So 12px=0.75em, 10px=0.625em.