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

ajax請求默認 contentType=application/x-www-form-urlencoded;charset:utf-8，此格式爲表單提交格式，數據爲key1=value1&key2=value2格式；

不使用contentType: “application/json”則data可以是對象；

$.ajax({
url: actionurl,
type: "POST",
datType: "JSON",
data: { id: nodeId },
async: false,
success: function () {}
});

使用contentType: “application/json”則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 () {}
});