方法一(被处理的必须为 Number
let str = 123456789;
y.toLocaleString() //123,456,789
方法二(被处理的为String类型的数字)
let reg = /(\d)(?=(?:\d{4})+$)/g;
let str = '123456789';
let target = str.replace(reg, '$1,') //1,2345,6789
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方法一(被处理的必须为 Number
let str = 123456789;
y.toLocaleString() //123,456,789
方法二(被处理的为String类型的数字)
let reg = /(\d)(?=(?:\d{4})+$)/g;
let str = '123456789';
let target = str.replace(reg, '$1,') //1,2345,6789
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