答案:目前无解,tableau JS API 没有设置access-control-allow-origin 的命令.
如下代码，向 http://124.**.**.**:3306/trusted 提交表单，
静态页面，利用body onload事件自动提交后，在页面上打印出服务器返回的token值，输出代码结果如下：
<pre style="word-wrap: break-word; white-space: pre-wrap;">Kc0WOmoaT_-onNkXGzKR2Q==:feVJdMutEKc4Po9rkHfE562o</pre>
将 <form>表单中的<table>内容放在 Angular8 http.post 的 body 中，提交失败，提示跨域，但跨域问题已经解决了。
<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>样例展示</title>
<script type="text/javascript">
function submitForm(){
document.getElementById('form1').action =
document.getElementById('server').value + "/trusted";
}
</script>
<script>
function presubmit(){
submitForm();
document.getElementById('form1').submit();
}
</script>
</head>
<body onload="presubmit()">
<form method="post" id="form1" onSubmit="submitForm()">
<table>
<tr>
<td >Username</td>
<td><input type="text" name="username" value="admin" /></td>
</tr>
<tr>
<td>Server</td>
<td><input type="text" id="server" name="server" value="http://124.**.**.**:3306" /></td>
</tr>
<tr>
<td>Client IP (optional)</td>
<td><input type="text" id="client_ip" name="client_ip" value="223.104.236.96" /></td>
</tr>
<tr>
<td>Site (leave blank for Default site; otherwise enter the site name)</td>
<td><input type="text" id="target_site" name="target_site" value="" /></td>
</tr>
<tr>
<td> </td>
</tr>
</table>
</form>
</body>
</html>
Angular8 中提交代码如下：
getJsToken() {
const headers = new HttpHeaders().set('Content-Type', 'application/json')
.set('Content-Type', 'application/x-www-form-urlencoded');
const body = '<table>' +
'<tr>' +
'<td>Username</td>' +
'<td><input type="text" name="username" value="admin" /></td>' +
'</tr>' +
'<tr>' +
'<td>Server</td>' +
'<td><input type="text" id="server" name="server" value="http://124.**.**.**:3306" /></td>' +
'</tr>' +
'<tr>' +
'<td>Client IP (optional)</td>' +
'<td><input type="text" id="client_ip" name="client_ip" value="223.104.236.105" /></td>' +
'</tr>' +
'<tr>' +
'<td>Site (leave blank for Default site; otherwise enter the site name)</td>' +
'<td><input type="text" id="target_site" name="target_site" value="" /></td>' +
'</tr>' +
'<tr>' +
'<td> </td>' +
'</tr>' +
'</table>';
const hdr = { headers };
return this.http.post(this.uri_tableau + 'trusted', body, hdr)
.pipe(map(
(res: {credentials: Token}) => {
console.log(res)
return res;
}));
}
Angular提交错误如下：
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