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js實現簡單的二級聯動效果，js實現聯動
話不多說，請看代碼：
<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <title></title></head><body><script> window.onload = function () { // 建立兩個下拉式清單 var sel1 = document.createElement("select"); var sel2 = document.createElement("select"); // 添加到body中 document.body.appendChild(sel1); document.body.appendChild(sel2); var arr = ["未選擇","法師", "射手", "輔助", "打野"]; var arr1 = ["卡牌", "魚人", "維克托", "拉克絲"]; var arr2 = ["寒冰", "德萊文", "維恩", "維魯斯"]; var arr3 = ["布裡茨", "娜美", "布隆", "錘石"]; var arr4 = ["貝爺", "螳螂", "蠻子", "劍聖"]; function addChild(abj, arr) { for (var i = 0; i < arr.length; i++) { // 迴圈建立opt元素 var opt = document.createElement("option"); // 設定option元素的內容，內容為傳入的數組內容 opt.innerText = arr[i]; // 把option添加到select中 abj.appendChild(opt); } } // 給第一個下拉式清單添加資料 addChild(sel1, arr); // 給第一個下拉式清單添加改變值得方法 sel1.onchange = function () { remoOpt();// console.log(sel1.selectedIndex) switch (sel1.selectedIndex){ case 1: addChild(sel2,arr1); break; case 2: addChild(sel2,arr2); break; case 3: addChild(sel2,arr3); break; case 4: addChild(sel2,arr4); break; } }; //刪除函數 function remoOpt() { for(var i = sel2.children.length-1;i>=0;i--){ sel2.children[i].remove(); } } }</script></body></html>
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