我想将数字的小数位四舍五入到 5 的下一个倍数我已经尝试过这个，但它不适用于小数位

const roundOff = (num) =>{

 let temp = parseFloat(num.toFixed(2)) // to make it 2 place decimal
 return Math.ceil(temp / 5) * 5

  }

roundOff(54.5678)  // should give 54.60
roundOff(43.738)   // should give 43.75
roundOff(89.982)   // should give 90.00 
roundOff(80.034)   // should give 80.05

回答

const roundOff = (num) =>{
 return (Math.ceil(num * 20) / 20).toFixed(2)
}

console.log(roundOff(54.5678))  // should give 54.60
console.log(roundOff(43.738))   // should give 43.75
console.log(roundOff(89.982))   // should give 90.00 
console.log(roundOff(80.034))