我如何从其他网站获取元数据？ [英] How I can get metadata from another site ?

问题描述

大家好。我想尝试从网站获取元标记。也许有人知道我该怎么做？



我尝试过：



我正在尝试使用这样的JS代码：

Hello everyone. I want to try get meta tags from website. Maybe someone knows how I can do this?

What I have tried:

I'm trying with JS code like this:

$.ajax({
    url: "http://example.com",
    dataType: 'text',
    success: function(data) {
        var elements = $("meta").html(data)[0].getElementsByTagName("head");
        for(var i = 0; i < elements.length; i++) {
            var theText = elements[i].firstChild.nodeValue;
            console.log(theText);
        }
    }
});

但是，我收到此错误无法加载http://example.com：否'access-Control-Allow-Origin'标头出现在请求的资源上。因此，不允许来源http://example.com访问。

But, I get this error Failed to load http://example.com: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://example.com' is therefore not allowed access.

推荐答案

.ajax（{
url： http://example.com，
dataType：' text'，
成功： function （数据）{
var elements =

.ajax({ url: "http://example.com", dataType: 'text', success: function(data) { var elements =

（ meta）。html（data）[ 0 ]。getElementsByTagName（ < span class =code-string> head）;
for （ var i = 0 ; i< elements.length; i ++）{
var theText = elements [i] .firstChild.nodeValue;
控制台 .log中（theText）;
}
}
}）;

("meta").html(data)[0].getElementsByTagName("head"); for(var i = 0; i < elements.length; i++) { var theText = elements[i].firstChild.nodeValue; console.log(theText); } } });

但是，我收到此错误无法加载http://example.com：否'access-Control-Allow-Origin'标头出现在请求的资源上。因此，不允许访问http://example.com。

But, I get this error Failed to load http://example.com: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://example.com' is therefore not allowed access.

出于安全原因，您无法在纯Javascript中执行此操作。您需要在自己的站点上使用代理脚本，该脚本向目标站点发出请求，读取元数据并将其返回到您的脚本。



如何操作取决于您使用的服务器端语言。例如，使用ASP.NET：

以编程方式读取任何页面的元标记而不在浏览器中加载 [ ^ ]

You can't do that in pure Javascript for security reasons. You'll need to use a proxy script on your own site, which issues a request to the target site, reads the metadata, and returns it to your script.

How you do that will depend on which server-side language you're using. For example, with ASP.NET:
Reading Meta Tags of Any Page Programatically without loading in browser[^]

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