<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>URL有效性检测</title>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#checkokornot").text("Jquery is working ...");
});
</script>
</head>
<body>
<h1>URL有效性检测</h1>
<h2>Jquery通过jsonp请求方式判断URL是否有效</h2>
<span id="checkokornot" style="color: #008000;"></span><br/><br/>
<input type="text" id="urlForValidate" value="https://www.baidu.com"/>
<input type="button" id="" value="验证URL" onclick="NetPing()"/>
<script type="text/javascript">
function NetPing() {
var urlForValid = $("#urlForValidate").val();
if(urlForValid.indexOf('http')<0){alert("URL必须以http:// 或 https://开头！");return false;}
$.ajax({
url: urlForValid,
type: "GET",
timeout:3000,
dataType: "jsonp",
complete: function(response, textStatus) {
if(response.status == 404) {
alert("URL请求失败！");
}else if(response.status == 200){
alert("响应状态码：" + response.status + "
响应信息： " + textStatus + "
URL状态正常！");
}else {
alert("响应状态码：" + response.status + "
响应信息： " + textStatus + "
URL 可能失效了！");
}
}
});
}
</script>
</body>