$.ajax等相关用法

$.ajax({
            type: "GET",
            url: "url",
            data: {username:$("#username").val(), content:$("#content").val()},
　　　　　　　　　　 // data: "username=" + $("#username").val()+ "&content=" + $("#content").val()",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {
                // Play with returned data in JSON format
            },
            error: function (msg) {
                alert(msg);
            }
        });

$.getJSON(
    "url", 
    { name: "zero", time: "2pm" }, 
    function(json){
    alert("JSON Data:");
});

$.post("url", { "func": "func" },
   function(data){
     alert(data.name); 
     console.log(data.time); //  2pm
   }, "json");

$.get("url", { name: "zero"},
  function(data){
    alert("Data Loaded: " + data);
  });