数字千分位正则表达式

数字千分位正则表达式是 /(\d)(?=(?:\d{3})+$)/g。这个表达式的含义是匹配每个数字后面的位置，该位置后面跟着3个数字的倍数个数。它使用了正则表达式的零宽正向预查，即(?=pattern)。这个表达式可以用来给数字添加千分位，例如将数字12345678转换为"12,345,678"。 <span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>
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