javascript - 舍入函数并添加 "$"

Question

我已经搜索并尝试了多次，但仍然无法获取。如何在前面添加“$”并将值四舍五入到最接近的小数点后 100 位。示例:$100.00

<script>
  $.get("https://api.coinmarketcap.com/v1/ticker/", function(data, status) {
    for (var i = 0; i < data.length - 1; i++) {
      if (data[i].id == "unit") {
        $("#unit").html(parseFloat(data[i].price_usd) * 500000);
      }
    }
  });
</script>

Answer 1

使用 Number.prototype.toFixed() 来固定小数位数，照常连接字符串，因为 toFixed 返回字符串:

function toCurrency(value = 0, symbol = '$', onEnd = false) {
  if (onEnd) {
    return Number(value).toFixed(2) + symbol;
  }
  return symbol + Number(value).toFixed(2);
}

console.log(toCurrency(123.7483));
console.log(toCurrency(123));
console.log(toCurrency(123, ' USD', true));