摘要: $$ \mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\ \frac{\partial X}{\partial u} & \frac{\partial Y}{\parti 阅读全文
posted @ 2018-12-24 17:25 曾志呀 阅读(117) 评论(0) 推荐(0)
摘要: 如下: function codePointLength(text){ var result = text.match(/[\s\S]/gu); return result? result.length:0; } var s = '𠮷𠮷'; s.length //4 codePointLength(s) //2 阅读全文
posted @ 2018-12-24 11:32 曾志呀 阅读(611) 评论(0) 推荐(0)