fix: use getComputedStyle instead getBoundingClientRect. #975
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使用getComputedStyle代替getBoundingClientRect解决issue.
发现issue出现的原因是之前的一次修复使用了getBoundingClientRect 代替offsetWidth,目的是解决offsetWidth只能读取整数的问题,但是这会取值到当前实际的宽度,即300px 乘以 1.5的缩放 总共450px, 当悬浮节点挂载在1.5缩放的div里后,之前设置的450px 会被再乘以1.5倍的缩放。
所以使用getComputedStyle读取width值,他可以读取到select的精确宽度。