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js验证url是否有效，支持跨域的验证
背景：有时候我们不仅仅验证url是否正确，还需要验证是否能真正访问
原理：先用正则校验过后，然后用ajax去模拟请求，能响应200，说明url真实有效，跨域用jsonp，超时设置越短越好。
$.ajax({ type: 'get', cache: false, url: url, dataType: "jsonp",
//跨域采用jsonp方式 processData: false, timeout:1000, //超时时间，毫秒 complete: function
(data) { if (data.status==200) { if($('input[name=is_link_origin_url]').val()
== '1'){ $('input[name=is_link_origin_url]').val('0'); }else {
$('input[name=is_link_origin_url]').val('1'); } } else {
$('#check-btn').removeAttr('checked');
$('input[name=is_link_origin_url]').val('0'); alert("无效链接"); } } });
