how to post array by store of sencha - arrays

Question

I create one store and init it with some params with one array.when I execute the load function, the array parameter becomes a string '[object object]'
the code as follows:
store:
Ext.define('test.store.info',{
extend: 'Ext.data.Store',
config:{
model:'test.model.info',
proxy:{
type:'ajax',
url:'http://domain/path',
actionMethods:'POST'
}
}
});
model:
Ext.define('test.model.info',{
extend:'Ext.data.Model',
config:{
fields:[
'code',
'data'
]
}
})
use in controller:
var store = Ext.getStore('info');
params = {
t1:[{
f1:'aa'
},{
f2:'bb'
}],
t2:'ddd'
}
console.log(params)
store.load({
params:params
});
or I just use Ajax function instead load function , the result is the same.
Ext.Ajax.request({
url:'http://domain/path',
method:'post',
params:params,
});
I check the xhr within network of browser , it is a string as follows:
t1:[object Object]
t1:[object Object]
t2:ddd
when I check the server log, it shows :
t1:'[object Object]'
t1:'[object Object]'
t2:'ddd'

Answer 1

I found the solution , thank you
1, just use jsonData instead params during Ajax, like follows:
Ext.Ajax.request({
url: ajmd.util.version.getHost()+'/archimedes/update/selfInfo',
method:'post',
// params:params,
jsonData:params
});
2, or just encode the data before send
params.t1 = Ext.encode(params.t1);

Answer 2

If you name the parameter "foo[]", then it will encode it as a POST array making it easy to consume on the server side. Note the [] at the end.
var companies = [1,2,3];
Ext.Ajax.request({
url: '...',
method: "post",
params: {
'companies[]': companies,
},
success: function (response) {
console.log("done");
}
});