计算HTML中选中的复选框的数量

问题描述

因此，基本上我想统计所打勾的复选框的数量.我将代码设置为可以成功计数的点，但是我想添加一个警报，其中显示选中的复选框数量，代码可以执行此操作，但不显示总计数，它会在每次刷新时增加总计数.我只想知道如何显示总数.

So basically i want to count the number of checkboxes that are ticked. I get my code to the point where it counts them successfully, but I want to put in an alert that shows the number of checkboxes ticked, the code does this but doesn't show the total count, it increments the total every refresh. I just want to know how I can show a total count.

单击单选按钮是"时，它应该显示总计.

It should display the total when the radio button 'yes' is clicked.

<br />Apples
<input type="checkbox" name="fruit" />Oranges
<input type="checkbox" name="fruit" />Mango
<input type="checkbox" name="fruit" />
<br />Yes
<input type="radio" name="yesorno" id="yes" onchange="checkboxes()"

function checkboxes(){
    var inputElems = document.getElementsByTagName("input"),
    count = 0;
    for (var i=0; i<inputElems.length; i++) {
    if (inputElems[i].type === "checkbox" && inputElems[i].checked === true){
        count++;
        alert(count);
    }
}}

推荐答案

这应该可以解决问题:

alert(document.querySelectorAll('input[type="checkbox"]:checked').length);

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