How to send jquery datatables data via Ajax

A: Use: dataTable_instanc().rows().data().toArray()

How to send json data via Ajax

A: It need use JSON.stringtify(Array) to make the javascript object/array to be string,
and set the contentType to be: "application/json; charset=utf-8"

$.ajax({
    ...
    contentType:"application/json; charset=utf-8",
    data: JSON.stringtify({'name': 'ryan'})    
})

How to send Vue instance data via Ajax

A: Use {‘key’: Vue_instance.$data }

$.ajax({
    ...
    contentType:"application/json; charset=utf-8",
    data: JSON.stringtify({'general': general.$data})
})