~~~ /** * 检验URL链接是否有效 * * .Open("GET",URL, false) true:异步；false:同步 */ function getUrlState(URL) { var suc = false; var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); xmlhttp.Open("GET", URL, false); try { xmlhttp.Send(); } catch (e) { } finally { var result = xmlhttp.responseText; if (result) { if (xmlhttp.Status == 200) { suc = true; } else { suc = false; } } else { suc = false; } } return suc; } ~~~