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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<select id="test" name="">
<option value="1">text1</option>
<option value="2">text2</option>
</select>
<script>
// 1:拿到select对象:
var myselect = document.getElementById("test");
// 2:拿到选中项的索引:
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