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標籤：turn asc cte type 封裝 char doctype html 註冊
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 </head> 7 <body> 8 <input type="button" value="點擊選擇" id="bt"/><br/> 9 <select name="" id="ss">10 <option value="1">油炸榴蓮</option>11 <option value="2">紅燒臭豆腐</option>12 <option value="3">清蒸臭雞蛋</option>13 <option value="4">涼拌鹹鴨蛋</option>14 <option value="5" id="op1">爆炒小辣椒</option>15 </select>16 <script>17 //封裝id擷取元素18 function my$(id) {19 return document.getElementById(id);20 }21 //通過id擷取按鈕元素,註冊點擊事件,添加事件處理函數22 my$("bt").onclick = function () {23 //擷取點擊選中的菜單元素設定selected屬性值24 my$("op1").selected = true;25 };26 </script>27 </body>28 </html>
JavaScript DOM操作案例點擊按鈕選擇菜單
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