<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>fir</title>
</head>
<body>
<form id="form" method = "post" action = "http://www.kuaidi100.com/query?type=yuantong&postid=postttt&id=1&valicode=&temp=123">
<label>用户名:</label>
<input type="text" value="100605028323" postttt = "" id="txt" />
<input type="submit" value="确定" name="submit" id="sub"/>
</form>
<script>
var txt = document.getElementById("txt");
var btn = document.getElementById("sub");
var form = document.getElementById("form");
console.log(typeof form.action);
btn.onclick= function () {
var action = form.action;
form.action = action.replace(/postttt/, txt.value);
}
</script>
</body>
</html>
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