Question

如果输入元素的if语句中的数量为1 我的下面的代码警告300400它应该提醒700作为总和。

＆＃13;

function validateCart() {
  var check = false;
  var bill="";
  if (document.getElementById("bbc").checked) {
    check = true;
    var price = 300;
    var quantity = document.getElementById("bbq").value;
    var total = price * quantity;
    bill += total;
  };
  if (document.getElementById("gbc").checked) {
    check = true;
    var price = 400;
    var quantity = document.getElementById("gbq").value;
    var total = price * quantity;
    bill += total;
  };
  if (!check) {
    alert("no item selected");
  } else {
    alert(bill);
  };
};

＆＃13;

我无法弄清楚我做了什么错误。

Answer 1

您需要将帐单初始化为0：

function validateCart() {
  var check = false;
  var bill = 0;
  if (document.getElementById("bbc").checked) {
    check = true;
    var price = 300;
    var quantity = document.getElementById("bbq").value;
    var total = price * quantity;
    bill += total;
  };
  if (document.getElementById("gbc").checked) {
    check = true;
    var price = 400;
    var quantity = document.getElementById("gbq").value;
    var total = price * quantity;
    bill += total;
  };
  if (!check) {
    alert("no item selected");
  } else {
    alert(bill);
  };
};

js打印为文本而不是计算

1 个答案: