<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
window.onload=function () {
var id=new Array(1,2,3);
var value=new Array("北京","上海","天津");
var select=document.getElementById("slt");
select.options[0].selected=true;
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</head>
<body>
<select id="slt">
<option value="0"></option>
</select>
</body>
</html>
