话不多说,请看代码:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
[removed]
[removed] = function () {
// 创建两个下拉列表
var sel1 = document.createElement("select");
var sel2 = document.createElement("select");
// 添加到body中
document.body.a