javascript function getSelectedOptions { var selectEl = document.getElementById; var selectedOpts = ; for { selectedOpts.push; } return selectedOpts; }

// 用示例 var selectedOptions = getSelectedOptions; console.log; // 输出选中项的值数组

// geng新鲜选中的选项个数并kan得出来在元素上 var selectedNum = document.getElementById.selectedOptions.length; document.getElementById.setAttribute");