您正在尝试维护页面之间的状态。通常有两种方式来维护状态：
- 在 cookie 中存储状态
- 在查询字符串中存储状态
无论哪种方式，您的第一个页面都必须保持状态（到 cookie 或查询字符串），而另一个页面必须 - 单独 - 恢复状态。您不能在两个页面上使用相同的脚本。
示例：使用 Cookies
使用 cookie，第一页必须将下一页所需的所有表单数据写入 cookie：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With Cookies</title>
</head>
<body>
<div>
Setting cookies and redirecting...
</div>
<script>
// document.cookie is not a real string
document.cookie = 'form/title=My Name is Richard; expires=Tue, 29 Aug 2017 12:00:01 UTC'
document.cookie = 'form/text=I am demoing how to use cookies in JavaScript; expires=Tue, 29 Aug 2017 12:00:01 UT';
setTimeout(function(){
window.location = "./form-cookies.html";
}, 1000);
</script>
</body>
</html>
...然后第二个页面将读取这些 cookie 并用它们填充表单字段：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With Cookies</title>
</head>
<body>
<form id="myForm" action="submit.mumps.cgi" method="POST">
<input type="text" name="title" />
<textarea name="text"></textarea>
</form>
<script>
var COOKIES = {};
var cookieStr = document.cookie;
cookieStr.split(/; /).forEach(function(keyValuePair) { // not necessarily the best way to parse cookies
var cookieName = keyValuePair.replace(/=.*$/, ""); // some decoding is probably necessary
var cookieValue = keyValuePair.replace(/^[^=]*\=/, ""); // some decoding is probably necessary
COOKIES[cookieName] = cookieValue;
});
document.getElementById("myForm").getElementsByTagName("input")[0].value = COOKIES["form/title"];
document.getElementById("myForm").getElementsByTagName("textarea")[0].value = COOKIES["form/text"];
</script>
</body>
</html>
示例：使用查询字符串
在使用查询字符串的情况下，第一页将只在重定向 URL 中包含查询字符串，如下所示：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With The Query String</title>
</head>
<body>
<div>
Redirecting...
</div>
<script>
setTimeout(function(){
window.location = "./form-querystring.html?form/title=My Name is Richard&form/text=I am demoing how to use the query string in JavaScript";
}, 1000);
</script>
</body>
</html>
...然后表单将解析查询字符串（在 JavaScript 中通过 window.location.search 提供 - 以 ? 开头）：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With The Query String</title>
</head>
<body>
<form id="myForm" action="submit.mumps.cgi" method="POST">
<input type="text" name="title" />
<textarea name="text"></textarea>
</form>
<script>
var GET = {};
var queryString = window.location.search.replace(/^\?/, '');
queryString.split(/\&/).forEach(function(keyValuePair) {
var paramName = keyValuePair.replace(/=.*$/, ""); // some decoding is probably necessary
var paramValue = keyValuePair.replace(/^[^=]*\=/, ""); // some decoding is probably necessary
GET[paramName] = paramValue;
});
document.getElementById("myForm").getElementsByTagName("input")[0].value = GET["form/title"];
document.getElementById("myForm").getElementsByTagName("textarea")[0].value = GET["form/text"];
</script>
</body>
</html>
示例：使用片段标识符
还有一个选择：由于状态是在客户端（而不是在服务器端）严格维护的，您可以将信息放在片段标识符（URL 的“散列”部分）中。
第一个脚本与上面的查询字符串示例非常相似：重定向 URL 仅包含片段标识符。为方便起见，我将重新使用查询字符串格式，但请注意 # 曾经位于 ? 的位置：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With The Fragment Identifier</title>
</head>
<body>
<div>
Redirecting...
</div>
<script>
setTimeout(function(){
window.location = "./form-fragmentidentifier.html#form/title=My Name is Richard&form/text=I am demoing how to use the fragment identifier in JavaScript";
}, 1000);
</script>
</body>
</html>
...然后表单必须解析片段标识符等：
<!DOCTYPE html>
<html>
<head>
<title>Maintaining State With The Fragment Identifier</title>
</head>
<body>
<form id="myForm" action="submit.mumps.cgi" method="POST">
<input type="text" name="title" />
<textarea name="text"></textarea>
</form>
<script>
var HASH = {};
var hashString = window.location.hash.replace(/^#/, '');
hashString.split(/\&/).forEach(function(keyValuePair) {
var paramName = keyValuePair.replace(/=.*$/, ""); // some decoding is probably necessary
var paramValue = keyValuePair.replace(/^[^=]*\=/, ""); // some decoding is probably necessary
HASH[paramName] = paramValue;
});
document.getElementById("myForm").getElementsByTagName("input")[0].value = HASH["form/title"];
document.getElementById("myForm").getElementsByTagName("textarea")[0].value = HASH["form/text"];
</script>
</body>
</html>
如果您无法编辑表单页面的代码
Try a greasemonkey script.