最近在做项目交互的时候，刚开始向后台传递数据返回，后来百度添加了 contentType："application/json" 之后返回，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“的时候可以向后台发送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)
}
})