如何在POSIXct中获得一天的开始(How to get the beginning of the day in POSIXct)

 $ .ajax方法的默认contentType是'application/x-www-form-urlencoded' 
 
 如果您想发送JSON，则必须指定您正在发送JSON，否则模型活页夹将无法正常工作： 
 
$.ajax({
        type: 'post',
        url: "@Url.Action("SaveTireRunModel", "Events")",
        data: tirerun,
        contentType: 'application/json',
        success: function(result) {
            if (!result.success) {
                alert(result.error);
            } else {}
        }
    });
 
 您可能还需要使用以下data: JSON.stringify(tirerun)对数据进行“ data: JSON.stringify(tirerun) ”： data: JSON.stringify(tirerun) 

The default contentType for the $.ajax method is 'application/x-www-form-urlencoded'
 
If you want to send JSON you have to specify that your are sending JSON otherwise the Model Binder won't work correctly:
 
$.ajax({
        type: 'post',
        url: "@Url.Action("SaveTireRunModel", "Events")",
        data: tirerun,
        contentType: 'application/json',
        success: function(result) {
            if (!result.success) {
                alert(result.error);
            } else {}
        }
    });
 
You maybe also need to "stringify" the data with : data: JSON.stringify(tirerun)