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ajax中设置contentType: "application/json"的作用

2020-06-04 12:47:29
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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 () {}});

总结

以上所述是小编给大家介绍的ajax中设置contentType: "application/json"的作用,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对错新站长站网站的支持!

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