如何在此函数之前返回带有美元符号的函数。(Javascript)

Question

我正在根据变量制作不同价格的转换器，我处于起步阶段，我想知道如何在数字输出之前添加美元符号。 function myFunction() { var x = document.getElementById("myText").value; document.getElementById("demo").innerHTML = (x * .97).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ","); }<input id="myText" placeholder="$149,995.00" type="number"><button onclick="myFunction()" type="button">Convert</button><h1 id="demo"></h1>

Answer 1

只需"$" +在前面添加一个：

function myFunction() {

 var x = document.getElementById("myText").value;

 document.getElementById("demo").innerHTML =  "$" + (x * .97).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");

 }

<input id="myText" placeholder="$149,995.00" type="number">

<button onclick="myFunction()" type="button">Convert</button>

<h1 id="demo"></h1>

Answer 2

我希望这是你所期待的

function myFunction() {

  var x = document.getElementById("myText").value;

  var amount = (x * .97).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");

  document.getElementById("demo").innerHTML = "$" + amount;

 }

<input id="myText" placeholder="$149,995.00" type="number">

<button onclick="myFunction()" type="button">Convert</button>

<h1 id="demo"></h1>

Answer 3

 function myFunction() {

 var x = document.getElementById("myText").value;

 document.getElementById("demo").innerHTML = "$"+(x * .97).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");

 }

<input id="myText" placeholder="$149,995.00" type="number">

<button onclick="myFunction()" type="button">Convert</button>

<h1 id="demo"></h1>