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想了解一下是不是故意不做左右边缘的判断:)
查看Tip的文档,当tip的内容比较长,而且tip比较接近于浏览器的右边缘,而tip又没有显式指定宽度,tip的内容会自动折行。如果直接计算的话计算出来的tip的长度是折行后的长度,导致改变tip的位置后,tip相对于trigger的位置不正确。
所以在arale/position又提了一个pull request aralejs/position#8,来支持获取tip原来正确的宽度。