检查是否存在带有Firefox扩展名的Javascript的URL

Check if an URL exists with Javascript with a Firefox extension

本文关键字：扩展名 Javascript URL Firefox 是否 存在 检查      更新时间：2023-09-26

我想使用带有Firefox扩展的Javascript来检查给定的URL是否存在。

我想您想尝试加载URL-为此使用XMLHttpRequest：

var request = new XMLHttpRequest();
request.open("GET", url);
request.onload = function()
{
    if ((request.status >= 200 && request.status < 300) || request.status == 304)
        alert("Exists!");
    else
        alert("HTTP response isn't success, URL doesn't exist or is currently unavailable");
};
request.onerror = function()
{
    alert("Loading URL errored out, server doesn't exist or is currently unavailable");
};
request.send(null);
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