$.ajax中contentType: “application/json” 的用法

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 () {}});