是否可以使用Javascript检索文件的上次修改日期? [英] Is it possible to retrieve the last modified date of a file using Javascript?

问题描述

我在网页上有一组链接，这些链接可以链接到PDF表单和.doc表单.这些文件不存储在数据库中，而是按原样存储在服务器本地.是否可以使用Javascript检索PDF或DOC文件的最后修改日期?我没有使用Javascript的任何特定需求，但这是可取的.

I have a set of links on a web page that link to PDF forms and .doc forms. These files are not stored in a database, simply stored as they are, locally on the server. Is it possible to retrieve the last modified date of a PDF or DOC file using Javascript? I don't have any specific need to use Javascript, but it is preferable.

更新:现在，我意识到Javascript无法访问文件系统，是否有替代方法?

UPDATE: Now that I realize that Javascript can't access the filesystem, is there an alternative method?

推荐答案

如果它与调用函数位于同一服务器上，则可以使用XMLHttpRequest-

If it's on the same server as your calling function you can use XMLHttpRequest-

此示例不是异步的，但是您可以根据需要进行创建.

This example is not asynchronous, but you can make it so if you wish.

function fetchHeader(url, wch) {
    try {
        var req=new XMLHttpRequest();
        req.open("HEAD", url, false);
        req.send(null);
        if(req.status== 200){
            return req.getResponseHeader(wch);
        }
        else return false;
    } catch(er) {
        return er.message;
    }
}

alert(fetchHeader(location.href,'Last-Modified'));

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