创建动态菜单或下拉列表的JavaScript代码

function makeMenu(items, tags) {
 tags = tags || ['ul', 'li']; // default tags
 var parent = tags[0]; var child = tags[1]; 
 var item, value = ''; for (var i = 0, l = items.length; i < l; i++) {
 item = items[i]; // Separate item and value if value is present
 if (/:/.test(item)) {
 item = items[i].split(':')[0];
 value = items[i].split(':')[1];
 } // Wrap the item in tag
 items[i] = '<'+ child +' '+
 (value && 'value="'+value+'"') +'>'+ // add value if present
 item +'</'+ child +'>';
 } 
 return '<'+ parent +'>'+ items.join('') +'</'+ parent +'>';
}

// Dropdown select monthmakeMenu(
 ['January:JAN', 'February:FEB', 'March:MAR'], // item:value
 ['select', 'option']
); 
// List of groceriesmakeMenu(
 ['Carrots', 'Lettuce', 'Tomatos', 'Milk'],
 ['ol', 'li']
);