【js】全选-非全选

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>原生js - 全选、非全选</title>
  </head>
  <body>
    <div class="wrap">
      <label> <input type="checkbox" id="selectAll" /> 全选 </label>
      <label> <input type="checkbox" class="checkbox" /> 选项1 </label>
      <label> <input type="checkbox" class="checkbox" /> 选项2 </label>
      <label> <input type="checkbox" class="checkbox" /> 选项3 </label>
      <label> <input type="checkbox" class="checkbox" /> 选项4 </label>
      <label> <input type="checkbox" class="checkbox" /> 选项5 </label>
    </div>
    <script>
      var Roc = {
        selectAll: document.getElementById("selectAll"),
        checkboxs: document.getElementsByClassName("checkbox"),

        init: function () {
          this.handleCheck();
        },
        handleCheck: function () {
          var that = this;
          // 全选复选框的点击事件
          that.selectAll.addEventListener("click", function () {
            for (let i = 0; i < that.checkboxs.length; i++) {
              that.checkboxs[i].checked = that.selectAll.checked;
            }
          });
          // 单个复选框的点击事件
          for (let i = 0; i < that.checkboxs.length; i++) {
            that.checkboxs[i].addEventListener("click", function () {
              let allChecked = true;
              for (let j = 0; j < that.checkboxs.length; j++) {
                if (!that.checkboxs[j].checked) {
                  allChecked = false;
                  break;
                }
              }
              that.selectAll.checked = allChecked;
            });
          }
        },
      };
      Roc.init();
    </script>
  </body>
</html>