ajax跨域请求前端 $.ajax({ type: 'post', crossDomain: true, url: 'http://localhost:10771/RMBase/API/APIHandler.ashx', data:{ "UserName": "aabbc","Pwd":"123" }, contentType: "application/json", // POST时必须 xhrFields: { 'Access-Control-Allow-Origin': '*' }, success: functi