我想做一个计算器,它可以自动填充一个文本字段,并计算出 user input * 12
.
我可以解释的最好方法是 user input * 12 = text input field result
.
编码。
function add_number() {
var monthlyPayment = parseInt(document.getElementById("monthlyPayment").value);
var maintFees = parseInt(document.getElementById("maintFees").value);
var memFees = parseInt(document.getElementById("memFees").value);
var exchFees = parseInt(document.getElementById("exchFees").value);
var result = monthlyPayment + maintFees + memFees + exchFees;
document.getElementById("txtresult").value = result;
function mpTwelve() {
var monPay = parseInt(document.getElementById("monthlyPayment").value);
var monTwe = monPay * 12;
document.GetElementById("mpTimesTwelve").value = mpTimesTwelve;
}
}
你有一些错误。替换 document.GetElementById("mpTimesTwelve").value = mpTimesTwelve;
到 document.getElementById("mpTimesTwelve").value = monTwe
请看操场上的例子。https:/jsfiddle.netdenisstukalovvywb9mqg5#&一起js=2ICJ01oHQu。