这篇文章主要介绍了ajax中设置contentType: “application/json”的作用,需要的朋友可以参考下

最近在做项目交互的时候,刚开始向后台传递数据返回 415 ,后来百度添加了 contentType:“application/json“ 之后返回400,然后把传输的数据格式改为json字符串就传输成功了,现在我们来看看 contentType:“application/json“的作用:

添加 contentType:“application/json“之后,向后台发送数据的格式必须为json字符串

$.ajax({ type: "post", url: "mobile/notice/addMessageInfo.jspx", contentType: "application/json", data:"{'name':'zhangsan','age':'15'}", dataType: "json", success: function(data) { console.log(data); }, error: function(msg) { console.log(msg) } })

不添加 contentType:“application/json“的时候可以向后天发送json对象形式

$.ajax({ type: "post", url: "mobile/notice/addMessageInfo.jspx", data:{name:'zhangsan',age:'15'}, dataType: "json", success: function(data) { console.log(data); }, error: function(msg) { console.log(msg) } })

另外,当向后台传递复杂json的时候,同样需要添加 contentType:“application/json“,然后将数据转化为字符串

var data = { uploadarray: uploadarray, messageInfo: { messageTitle: messageTitle, messageContent: messageContent, publisher: publisher }, userId: userId } $.ajax({ type: 'post', url: "mobile/notice/addMessageInfo.jspx", contentType: 'application/json', data: JSON.stringify(data), dataType: "json", success: function(data) { console.log(data); }, error: function(msg) { console.log(msg) } })

补充:下面看下$.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 () {} });

上面是我整理给大家的,希望今后会对大家有帮助。

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