ajax 传递数组参数

var arr = new Array(3)

arr['color'] = "George";
arr['color2'] = "John";
arr['color3'] = "Thomas";

var param = '';
for(var i in arr){
    param += i +':"'+arr[i]+'",';
}
param = param.substring(0,param.length-1);
var aaa = '{page:'+page+','+param+'}';
param =eval('('+aaa+')');

$.ajax({
    url:url,
    traditional: true,
    dataType: 'json',
    type: 'post',
    data: param,
    success: function(list) {}
});