在屏幕截图中，我想在框中自动添加货币，我如何让它这样做。货币每天都在变化
html和javascript中的代码

<font color="red"><b><label for="usd">leave blank</label></b></font>

<font color="PURPLE"><b><label for="zar"></label></b></font>
<input style="color: #17202A; font-family: Comic Sans MS; font-weight: bold; font-size: 12px; background-color: #AED6F1; type="usdzar" id="zar" name="zar">
<button type="button" onclick="multiply1()">Multiply</button>
<input style="color: #17202A; font-family: Comic Sans MS; font-weight: bold; font-size: 12px; background-color: #E8F8F5; type="text" id="result1" name="result1">

下面第一行的结果是正确的

function multiply1(){
        var num3 = document.getElementById("result").value.replace(/,/g,''); //remove any commas
        var num4 = document.getElementById("zar").value;
        var result1 = num3 * num4;
        document.getElementById("result1").value = result1.toLocaleString('en-US',{ maximumFractionDigits: 8 });
        document.getElementById("result1").style.color = "red";
        document.getElementById("result1").style.fontWeight = "900";
    }

编辑我知道我必须从这个使用，但不知道正确的一个使用，尝试了一些，但仍然没有工作

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