jquery gantt 甘特图的source 如何取值？

[Renault_zhou]

第一种情况：（可行）
var dataPath = location.href.substring(0, location.href.lastIndexOf('/')+1) + "js/data1.txt";
$(".gantt").gantt({source: dataPath});

data1.txt里面的内容是 [
{"name":"renault",
"desc":"china",
"values":[
{"from":"/Date(1302203200000)/","to":"/Date(1310508000000)/","desc":"Type","customClass":"ganttRed"},
{"from":"/Date(1311026400000)/","to":"/Date(1311026400000)/","desc":"Type","customClass":"ganttGreen"}
]
}
]

第二种情况（可行）
$(".gantt").gantt({source: [
{"name":"renault",
"desc":"china",
"values":[
{"from":"/Date(1302203200000)/","to":"/Date(1310508000000)/","desc":"Type","customClass":"ganttRed"},
{"from":"/Date(1311026400000)/","to":"/Date(1311026400000)/","desc":"Type","customClass":"ganttGreen"}
]
}
]});
在ajax里 success: function (text) {
var da=nui.encode(text.data);

$(".gantt").gantt({source: da});
//document.write(da);
}
da的值就是第一种情况里的data1.txt里的值，source后面加数组不是也行么，为什么放da 总是按url去访问？ 如何实现？