不使用contentType: “application/json”则data可以是对象

$.ajax({

url: actionurl,

type: "POST",

datType: "JSON",

data: { id: nodeId },

async: false,

success: function () {}

});

使用contentType: “application/json”则data只能是json字符串

$.ajax({

url: actionurl,

type: "POST",

datType: "JSON",

contentType: "application/json"

data: "{'id': " + nodeId +"}",

async: false,

success: function () {}

});