ajax有无contentType: "application/json"的区别

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 () {}
});
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使用contentType: “application/json”则data只能是json字符串，（书写规则比较死板繁琐，所以我们开发时一般不写contentType）

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