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Niuke js3 separator

2022-07-02 17:23:00 【Drowned fish u】

Cattle guest JS3 Separator

describe
Please complete it JavaScript Code , The thousand separator string of the parameter number is required to be returned .
Example 1
Input ：
_comma(12300)

Output ：
‘12,300’

<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
    </head>
    <body>
    	
        <script type="text/javascript">
            function _comma(number) {
    
                //  The completion code 
                //  Negative judgment 
                let complex = false 
                let newStr = ''

                if (number < 0) {
    
                  complex = true
                }

                str = number.toString()
                //  Split string , Return string array  ['1', '2', '3', '4', '5', '6', '7']
                var arr = str.split('')
                
                //  Negative judgment , remove － Number 
                if (complex) {
    
                  arr.shift()
                }
                
                //  Invert the split string array  ['7', '6', '5', '4', '3', '2', '1']
                arr.reverse()

                //  From back to front , Add a delimiter to the array  ['7', '6', '5', ',', '4', '3', '2', ',' ,'1']
                for (let i = arr.length; i >= 0; i--) {
    
                  if ( i % 3 === 0 && i !== 0 ) {
    
                    arr.splice( i, 0, ',' )
                  }
                }

                //  Invert the split string array  ['1', ',', '2', '3', '4', ',', '5', '6', '7']
                arr.reverse()
            
                //  Judgment of special circumstances , When the first row of the array is ',' when , remove 
                if (arr[0] === ',') {
    
                  arr.shift()
                }

                arr.map((item) => {
     newStr += item })

                //  Negative judgment , add to － Number 
                if (complex) {
    
                  return '-' + newStr.toString()
                } else {
    
                  return newStr.toString()
                }

            }

            const num = _comma(1234567)
            console.log(num)
        </script>
    </body>
</html>
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https://yzsam.com/2022/183/202207021451157154.html

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