我如何返回这个 function 并在它前面加上一个美元符号。 (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

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 2

 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 3

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>