选择某个收音机时更新变量答案

【问题标题】：Update variable when a certain radio is selected选择某个收音机时更新变量
【发布时间】：2020-11-25 08:39:55
【问题描述】：

我有许多 id 编号为 1-15 的无线电 btns。选择它们后，我希望将 1 添加到 3 个变量之一（countA countB 或 countC），具体取决于它们的 id 数字。我无法弄清楚我的代码有什么问题！

var countA = 0
            var countB = 0
            var countC = 0 
            function check() {
                var selectors = document.getElementsByTagName("input")
                var numSelectors = selectors.length
                for (var i = 0; i < numSelectors; i++) {
                    if (selector[i].checked) {
                        if (selector[i].getAttribute("id") = "1" || selector[i].getAttribute("id") = "4" || selector[i].getAttribute("id") = "7" || selector[i].getAttribute("id") = "10" ||
                        selector[i].getAttribute("id") = "13") {
                            countA++
                        }
                        if (selector[i].getAttribute("id") = "2" || selector[i].getAttribute("id") = "5" ||
                        selector[i].getAttribute("id") = "8" || selector[i].getAttribute("id") = "11" ||
                        selector[i].getAttribute("id") = "14") {
                            countB++
                        }
                        if (selector[i].getAttribute("id") = "3" || selector[i].getAttribute("id") = "6" || selector[i].getAttribute("id") = "9" || selector[i].getAttribute("id") = "12" ||
                        selector[i].getAttribute("id") = "15") {
                            countC++
                            }
                            showCounts()
                    }
                            }
                            }

            function showCounts() {
                document.getElementById("testp").innerHTML = "Count A: " + countA + "Count B: " + countB + "Count C: " + countC
            }

【问题讨论】：

标签： javascript function for-loop if-statement variables

【解决方案1】：

选择器[i] 应该是选择器[i]，你错过了“s”

var countA = 0
var countB = 0
var countC = 0
function check() {
    var selectors = document.getElementsByTagName("input")
    var numSelectors = selectors.length
    for (var i = 0; i < numSelectors; i++) {
        if (selectors[i].checked) {
          if (selectors[i].getAttribute("id") = "1" || selectors[i].getAttribute("id") = "4"
            || selectors[i].getAttribute("id") = "7" || selectors[i].getAttribute("id") = "10"
            || selectors[i].getAttribute("id") = "13") {
              countA++
          }
          if (selectors[i].getAttribute("id") = "2" || selectors[i].getAttribute("id") = "5" ||
            selectors[i].getAttribute("id") = "8" || selectors[i].getAttribute("id") = "11" ||
            selectors[i].getAttribute("id") = "14") {
            countB++
          }
          if (selectors[i].getAttribute("id") = "3" || selectors[i].getAttribute("id") = "6"
            || selectors[i].getAttribute("id") = "9" || selectors[i].getAttribute("id") = "12"
            || selectors[i].getAttribute("id") = "15") {
              countC++
            }
            showCounts()
          }
    }
}

function showCounts() {
  document.getElementById("testp").innerHTML = "Count A: " + countA + "Count B: " + countB + "Count C: " + countC
}

【讨论】：