let val = 209394856954;
val = String(val).replace(/\s/g,'').replace(/(\d{4})(?=\d)/g,"$1 ");
console.log(val); //2093 9485 6954
let val = 209394856954;
val = String(val).replace(/\s/g,'').replace(/(\d{4})(?=\d)/g,"$1 ");
console.log(val); //2093 9485 6954
本文标题:【JavaScript】四个数字中间加空格
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