Javascript 访问共享扩展中的网页属性

当用户使用javascript文件在iOS上打开共享扩展时，我想访问网页属性（标题、元描述、URL、默认图像等）。我正在为javascript（）使用以下代码：

var MyExtensionJavaScriptClass=function（）{}；
MyExtensionJavaScriptClass.prototype={
运行：函数（参数）{
//将网页的baseURI传递给扩展名。
completionFunction（{“url”：document.baseURI}）；
completionFunction（{“host”：getHost（）}）；
arguments.completionFunction（{“title”：document.title}）；
completionFunction（{“description”：getDescription（）}）；
completionFunction（{“image”：getImage（）}）；
},
getHost:function（）{
var l=document.createElement（“a”）；
l、 href=href；
返回l.hostname；
},
getDescription:function（）{
var metas=document.getElementsByTagName（'meta'）；
对于（i=0；i，这里是我如何解决这个问题的

JS代码：

var MyExtensionJavaScriptClass = function() {};

MyExtensionJavaScriptClass.prototype = {
    getDescription: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "description") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    getImage: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "og:image" || metas[i].getAttribute("name") == "sailthru.image.full" || metas[i].getAttribute("name") == "twitter:image:src") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    run: function(arguments) {
    // Pass the baseURI of the webpage to the extension.
        arguments.completionFunction({"url": document.baseURI, "host": document.location.hostname, "title": document.title, "description": this.getDescription(), "image": this.getImage()});
    },
// Note that the finalize function is only available in iOS.
    finalize: function(arguments) {
        // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:].
    // In this example, the extension provides a color as a returning item.
    // document.body.style.backgroundColor = arguments["bgColor"];
    }
};

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS".
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass;

// ExtensionPreprocessingJS.test();

我的意思是metas[I].getAttribute（“name”）=“og:image”没有返回图像。@AsadullahAli条件的目标是检查URL中是否集成了open graph标记或sailthru或twitter卡。如果标记存在，则获取图像。此代码可能需要根据您正在测试的URL进行一些更新。您可以共享您正在测试的URL吗？是的，请检查这是meta图像标记。它有“属性”而不是“名称”。我将metas[I].getAttribute（“名称”）更改为metas[I].getAttribute（“属性”）。最后它给了我一个图像链接。感谢您获得了解决方案。
var MyExtensionJavaScriptClass = function() {};

MyExtensionJavaScriptClass.prototype = {
    getDescription: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "description") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    getImage: function() {
        var metas = document.getElementsByTagName('meta'); 
        for (i=0; i<metas.length; i++) { 
            if (metas[i].getAttribute("name") == "og:image" || metas[i].getAttribute("name") == "sailthru.image.full" || metas[i].getAttribute("name") == "twitter:image:src") { 
                return metas[i].getAttribute("content"); 
            }
        }
        return "";
    },
    run: function(arguments) {
    // Pass the baseURI of the webpage to the extension.
        arguments.completionFunction({"url": document.baseURI, "host": document.location.hostname, "title": document.title, "description": this.getDescription(), "image": this.getImage()});
    },
// Note that the finalize function is only available in iOS.
    finalize: function(arguments) {
        // arguments contains the value the extension provides in [NSExtensionContext completeRequestReturningItems:completion:].
    // In this example, the extension provides a color as a returning item.
    // document.body.style.backgroundColor = arguments["bgColor"];
    }
};

// The JavaScript file must contain a global object named "ExtensionPreprocessingJS".
var ExtensionPreprocessingJS = new MyExtensionJavaScriptClass;

// ExtensionPreprocessingJS.test();

for item: AnyObject in (self.extensionContext?.inputItems)! {
    let inputItem = item as! NSExtensionItem

    for provider: AnyObject in inputItem.attachments! {
        let itemProvider = provider as! NSItemProvider

        if itemProvider.hasItemConformingToTypeIdentifier(kUTTypePropertyList as String) {
            itemProvider.loadItemForTypeIdentifier(kUTTypePropertyList as String, options: nil, completionHandler: { (result: NSSecureCoding?, error: NSError!) -> Void in
                if let resultDict = result as? NSDictionary {
                    self.articleTitle = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["title"] as! String
                    self.articleHost = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["host"] as! String
                    self.articleDesc = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["description"] as! String
                    self.articleImage = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["image"] as! String
                    self.articleUrl = resultDict[NSExtensionJavaScriptPreprocessingResultsKey]!["url"] as! String
                }
            })
        }
    }
}