jqはjsonデータに基づいて、動的に2級連動メニューを生成する

  ：<select name="vegetable" id="vegetable">
			<option value="0">      </option>
		</select>
  ：<select name="fruit" id="fruit">
		<option value="0">      </option>
	</select>

let menu = [
	{
		"type_id" : 1,
		"name" : "  ",
		"food" : [
			{
				"food_id" : 1,
				"name" : "  ",
				"price" : "10"
			},
			{
				"food_id" : 2,
				"name" : "  ",
				"price" : "10"
			},
			{
				"food_id" : 3,
				"name" : "   ",
				"price" : "10"
			}	
		]
	},
	{
		"type_id" : 2,
		"name" : "  ",
		"food" : [
			{
				"food_id" : 4,
				"name" : "  ",
				"price" : "10"
			},
			{
				"food_id" : 5,
				"name" : "  ",
				"price" : "10"
			},
			{
				"food_id" : 6,
				"name" : "  ",
				"price" : "10"
			}	
		]
	}		
];

//   menu   ，            
for(let item of menu){
	let	html = `${item.type_id}">${item.name}`;
	$('#vegetable').append(html)
}
$('#vegetable').change(function(){
	//        ，         
	$('#fruit').html('      ');
	//   ：       value
	let index = $(this).val() - 1;
	if(index < 0){
		return;
	}
	//   value       food
	for(let item of menu[index].food){
		let	html = `${item.food_id}">${item.name}`;
		$('#fruit').append(html)
	}
})