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# 153812.7 转化153,812.7

## 解法1

```javascript
function dealNum(num){
    if(typeof num !== 'number') throw "input is not number"
    
    return num.toLocaleString()
}
```

## 解法2

实现思路是将数字转换为字符数组，再循环整个数组， 每三位添加一个分隔逗号，最后再合并成字符串。