19 lines
687 B
Markdown
19 lines
687 B
Markdown
### toDecimalMark
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Use commas to separate digits。
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Use `toString()` to convert the number `num` to a string, then use `/\B(?=(\d{3})+(?!\d))/g` to separate every three characters with a comma,except word boundary。
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```js
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const toDecimalMark = (num) => {
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let cleanNum = num.toString().split('').filter(n => '0123456789.'.includes(n)).join('')
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let wholeNum = cleanNum.split('.')[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")
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let decNum = `.${cleanNum.split('.')[1]}`
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return wholeNum + decNum;
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}
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// toDecimalMark(12305030388.9087) //-> '12,305,030,388.9087'
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// toDecimalMark(123.889087e2) //-> '12,388.9087'
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// toDecimalMark('12305abc030388.9087') // -> '12,305,030,388.9087'
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```
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