functionformatNumber(num) { if(isNaN(num)) { thrownewTypeError("num is not a number"); } return(""+ num).replace(/(\d{1,3})(?=(\d{3})+(?:$|\.))/g,"$1,"); } (\d{1,3})是一個(gè)捕獲分組,可以用$1來(lái)反向引用,?=(\d{3})+(?:$|\.)是正向斷言,表示匹配1到3個(gè)數(shù)字后面...
www.dbjr.com.cn/article/895...htm 2025-5-25