Why code below sent data as City=Moscow&Age=25 instead of JSON format?
var arr = {City:'Moscow', Age:25};
$.ajax(
{
url: "Ajax.ashx",
type: "POST",
data: arr,
dataType: 'json',
async: false,
success: function(msg) {
alert(msg);
}
}
);
Because you haven't specified neither request content type, nor correct JSON request. Here's the correct way to send a JSON request:
var arr = { City: 'Moscow', Age: 25 };
$.ajax({
url: 'Ajax.ashx',
type: 'POST',
data: JSON.stringify(arr),
contentType: 'application/json; charset=utf-8',
dataType: 'json',
async: false,
success: function(msg) {
alert(msg);
}
});
注意事项:
JSON.stringify method to convert a javascript object into a JSON string which is native and built-into modern browsers. If you want to support older browsers you might need to include json2.jscontentType property in order to indicate to the server the intent of sending a JSON requestdataType: 'json'属性用于您期望从服务器获得的响应类型.jQuery足够智能，可以从ServerContent-Type响应头中删除它.因此，如果您有一个或多或少遵守HTTP协议的web服务器，并以Content-Type: application/json响应您的请求，jQuery将自动将响应解析为success回调中的javascript对象，这样您就不需要指定dataType属性.注意事项:
arr是not an array.它是一个具有属性(City和Age)的javascript对象.数组在javascript中用[]表示.例如，[{ City: 'Moscow', Age: 25 }, { City: 'Paris', Age: 30 }]是2个对象的array.