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js-统计选项个数

2024-08-28 14:54:33   216人阅读

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript">
      window.onload = function(){
        var list = document.getElementById("list");
        var inputs = document.getElementsByTagName("input");
        var ok = document.getElementById("ok");
        var ret = document.getElementById("ret");
        ok.onclick = function(){
            var count = 0;
            for(var i = 0;i< inputs.length;i++){
                if(inputs[i].checked){
                  count ++;
                }
            }
            if(count > 0){
              ret.innerHTML = "已经选择"+count;
              ret.style.display = ‘block‘;
            }
            else{
              ret.innerHTML = " ";
              ret.style.display = none;
            }
        }
      }
    </script>
</head>
<body>
<ul id="list">
    <li><label><input type="checkbox"/>1</label></li>
    <li><label><input type="checkbox"/>2</label></li>
    <li><label><input type="checkbox"/>3</label></li>
    <li><label><input type="checkbox"/>4</label></li>
    <li><label><input type="checkbox"/>5</label></li>
</ul>
<button id="ok">确定</button>
<p id="ret" style="display: none"></p>
</body>
</html>

　　

js-统计选项个数


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