var dataArr = [{"username":"666","name2":"777"},{"username":"888","name2":"999"}];
var params = JSON.stringify(dataArr);
$.post("p.do", {params : params},
function(data){
});
var params = JSON.stringify(dataArr);
先转成字符串后，再发送
原文：http://my.oschina.net/u/1756290/blog/521249