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【笔记】JS指定数字位数

 1 year ago
source link: https://feiju12138.github.io/2022/07/29/JS%E6%8C%87%E5%AE%9A%E6%95%B0%E5%AD%97%E4%BD%8D%E6%95%B0/
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JS指定数字位数为固定的长度，如果不足，前面用0补齐

function PrefixInteger(num, length) {
  for(let len = (num + "").length; len < length; len = num.length) {
    num = "0" + num;
  }
  return num;
}

通过转换小数

function PrefixInteger(num, length) {
  let decimal = num / Math.pow(10, length);
  decimal = decimal.toFixed(length) + "";
  return decimal.substr(decimal.indexOf(".")+1);
}
function PrefixInteger(num, length) {
  return (Array(length).join('0') + num).slice(-length);  
}

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