当我执行 AJAX 调用时，出现以下错误：
未捕获的语法错误：意外的标记：
但是，当我直接在浏览器中访问相同的 URL 时，我得到了预期的 JSON 响应。
我做错了什么以及如何解决它？
下面是我的 jQuery AJAX 请求；
$.ajax({
type: 'GET',
url: "http://www.exampleUrl.com",
crossDomain: true,
dataType: "jsonp",
jsonp: "jsonp",
mimeType: "application/json",
jsonpCallback: 'callback',
contentType: "application/json; charset=utf-8",
beforeSend: function() {
//
},
success: function (data) {
alert("success");
},
error: function (result) {
//
}
});
您肯定遇到了 CORS 问题。
这种方法应该可以完美地工作：
$.ajax({
// The 'type' property sets the HTTP method.
// A value of 'PUT' or 'DELETE' will trigger a preflight request.
type: 'GET',
// The URL to make the request to.
url: 'http://html5rocks-cors.s3-website-us-east-1.amazonaws.com/index.html',
// The 'contentType' property sets the 'Content-Type' header.
// The JQuery default for this property is
// 'application/x-www-form-urlencoded; charset=UTF-8', which does not trigger
// a preflight. If you set this value to anything other than
// application/x-www-form-urlencoded, multipart/form-data, or text/plain,
// you will trigger a preflight request.
contentType: 'text/plain',
xhrFields: {
// The 'xhrFields' property sets additional fields on the XMLHttpRequest.
// This can be used to set the 'withCredentials' property.
// Set the value to 'true' if you'd like to pass cookies to the server.
// If this is enabled, your server must respond with the header
// 'Access-Control-Allow-Credentials: true'.
withCredentials: false
},
headers: {
// Set any custom headers here.
// If you set any non-simple headers, your server must include these
// headers in the 'Access-Control-Allow-Headers' response header.
},
success: function() {
// Here's where you handle a successful response.
},
error: function() {
// Here's where you handle an error response.
// Note that if the error was due to a CORS issue,
// this function will still fire, but there won't be any additional
// information about the error.
}
});
Source: 使用 CORS
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