使用jQuery验证url而不使用validate-plugin？

我需要使用jQuery 验证变量中的url ,但不能使用validate-plugin.有一个简单的方法吗？

您可以使用与验证插件相同的正则表达式(在2015年5月23日更新到最新的正则表达式):

function isUrlValid(url) {
    return /^(https?|s?ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i.test(url);
}

var testCases = [
    "http://www.google.com/",
    "https://www.google.com/",
    "ftp://www.google.com/",
    "http://google.com/",
    "http://google.com",
    "https://google.com",
    "http://www.google.com:80/",
    "https://www.google.com:443/",
    "http://127.0.0.1/",
    "http://127.0.0.1:9200/",
    "www.site.com",
    "x:",
    "http://",
    "javascript:alert('xss')",
    "http://w",
    "http:",
    "derp://www.google.com",
    "http://localserver"
],  div = document.getElementById("output");

for(var i=0; i < testCases.length; i++) {
    var test = testCases[i];
    div.innerHTML += (isUrlValid(test) ? "valid:   " : "invalid: ") + "" + test + "\n";
}

.valid { color: green; }
.invalid { color: red; }

if(/^(http|https|ftp):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/i.test($("#url").val())){
    alert("valid URL");
} else {
    alert("invalid URL");
}

var elm;
function isValidURL(u){
  if(!elm){
    elm = document.createElement('input');
    elm.setAttribute('type', 'url');
  }
  elm.value = u;
  return elm.validity.valid;
}

console.log(isValidURL('http://www.google.com/'));
console.log(isValidURL('//google.com'));
console.log(isValidURL('google.com'));

/^(http|https|ftp):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/ix

var url = $('input.surl').val();
url_validate = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
if(!url_validate.test(url)){
   alert('error');
}
else{
   alert('success');
}