var num = 123456789;
1.格式化为千分位输出 num.toLocaleString()
//"123,456,789"
2.格式化为千分位带$符号输出
num.toLocaleString("en-US",{style:"currency",currency:"USD"})
//"$123,456,789.00"
3.格式化为带¥符号输出
num.toLocaleString("zh-Hans-CN",{style:"currency",currency:"CNY"})
//"¥123,456,789.00"
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