[英]Check if an URL exists with Javascript with a Firefox extension
我想使用带有 Firefox 扩展名的 Javascript 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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